Sourdough Vietnamese Bánh Mì

Ingredients

Levain

Build this the night before. A stiffer levain keeps the sour in check, and a sour bánh mì is a wrong bánh mì.

• 100g (¾ cup + 2 tablespoons) all-purpose flour
• 65g (¼ cup + 1 teaspoon) water, room temperature
• 20g (1½ tablespoons) ripe sourdough starter, 100% hydration

Final Dough

The rice flour is not a substitution or a filler. It is the reason the crumb tears instead of chews.

• 340g (2⅞ cups) all-purpose flour
• 50g (5 tablespoons) white rice flour
• 240g (1 cup) water, 80°F (27°C)
• 25g (2 tablespoons) granulated sugar
• 10g (1¾ teaspoons) fine sea salt
• 14g (1 tablespoon) neutral oil

Total flour: 500g

Hydration: 63%

Pro tip: Use white rice flour, not sweet or glutinous rice flour. Sweet rice flour is a completely different starch and it will turn the crumb gummy. The bag usually says mochiko. Leave that one on the shelf.

Equipment

• Digital baking scale
• Bench scraper
• Bread lame
• Dough whisk
• Starter home
• Two half-sheet pans
• Metal pan for steam
• Spray bottle
• Instant-read thermometer
• Wire cooling rack

Method

Build the Levain

Ten minutes of work the night before. Everything else tomorrow depends on getting this one right.

1. Mix the levain. Stir the starter into the water until it breaks up and goes cloudy, then add the flour and mix to a stiff, shaggy paste. It will feel tight compared to the levain you might be used to. That is on purpose.
2. Ferment overnight. Cover and leave at 70 to 75°F (21 to 24°C) for 10 to 14 hours. It should roughly double, dome slightly, and smell like yogurt and green apple. If it smells sharp and acetone-like, it went too far. Use it anyway this time, then feed your starter more often before the next bake.

Wait: PT12H

Tip: At 65% hydration this levain is stiffer than a standard 1:1:1 build. Stiff levains ferment slower and produce more lactic acid and less acetic, which means a milder loaf. Bánh mì should taste of wheat and salt, not of sourdough.

Mix and Rest

Everything goes in together except the salt. Then you walk away and let the flour do the work you would otherwise do with your hands.

1. Check the levain. Drop a spoonful in room-temperature water. If it floats, go. If it sinks, give it another hour and check again. The float-test is not perfect, but on a stiff levain it is reliable enough.
2. Combine everything but the salt. Add the levain to the water and squeeze it apart until the water goes cloudy. Then add both flours, the sugar, and the oil. Mix until no dry flour remains.
3. Rest 40 minutes. Cover and leave it. This is a fermentolyse, not a classic autolyse, because the levain is already in there. The flour hydrates, the gluten starts organizing itself, and you get forty minutes of free kneading.
4. Add the salt and develop. Sprinkle the salt over the top, dimple it in with wet fingertips, then work the dough against the bowl for 3 to 4 minutes until it smooths out and starts pulling away from the sides. At 63% this dough is firm. It should feel like it is fighting you a little.

Wait: PT40M

Bulk Fermentation

Four to five hours at 76°F (24°C), with three sets of folds in the first ninety minutes.

1. First fold, 30 minutes in. Wet one hand. Grab the far edge, stretch it up until it resists, fold it over. Turn the bowl a quarter and repeat until you have gone all the way around. Four pulls. This is a stretch-and-fold, not a coil fold, because at 63% the dough is too firm for coils to do anything useful.
2. Second fold, 60 minutes in. Same four pulls. It will already feel tighter and smoother than the first round. That change is the gluten organizing.
3. Third fold, 90 minutes in. Last set. After this, leave it alone. Cover and let it finish.
4. Read the finish. You are done at roughly 50 to 70 percent growth, not double. Look for a domed surface, a few bubbles along the side of the container, and a jiggle when you shake the bowl. Overproofing this dough now costs you the ear later, because there will be no gas left for oven-spring.

Wait: PT4H30M

Tip: Temperature runs this clock, not the recipe. At 70°F expect closer to 6 hours. At 80°F it can be done in 3½. Judge the dough, not the timer.

Divide and Pre-Shape

Six pieces, six loose logs, then twenty minutes of doing nothing.

1. Divide into six. Turn the dough onto a lightly floured counter without deflating it more than you have to. Cut six pieces at about 144g each. Weigh them. Uneven pieces bake unevenly and you will notice it in the shape of the ear.
2. Pre-shape into loose logs. Flatten each piece gently into a small rectangle, fold the top third down and the bottom third up, then roll it into a loose log about 4 inches long. Not tight. Tight now means fighting it later.
3. Bench rest 20 minutes. Cover with a towel and leave them. The bench-rest lets the gluten relax so the final shaping does not tear the surface. Skipping this is the most common reason a shaped roll springs back and refuses to lengthen.

Wait: PT20M

Final Proof

Two paths. Cold is the one I would take, and not only for the schedule.

1. Arrange the shaped rolls. Seam side down on parchment-lined sheets, three per sheet, spaced at least 3 inches apart. They will grow sideways as well as up.
2. Cold retard, recommended. Cover loosely and refrigerate 10 to 14 hours. A cold cold-retard does something specific for this bread: it firms the skin, and a firm skin is what lets a shallow blade open a clean ear instead of dragging and tearing. It also means you bake in the morning without setting an alarm.
3. Same day, alternate. Cover and proof at room temperature for 1½ to 2½ hours until puffy and about 1½ times their original size, not doubled. Chill the shaped rolls uncovered for 20 minutes right before scoring. Even a short chill firms the skin enough to help.
4. Test before you score. Press a floured fingertip gently into the side. The dent should fill back in slowly and not quite completely. That is the poke-test. If it springs straight back, give it more time. If it does not come back at all, bake immediately and accept a modest ear.

Wait: PT12H

Tip: Bake straight from the fridge. Do not let them come to room temperature first. Cold dough into a hot oven is what gives you the burst of expansion that lifts the ear.

Shape the Torpedo

This is the part worth slowing down for. A bánh mì roll is a short baguette, and short is forgiving. Get this right here and the full-length baguettes in the Pantry stop being intimidating.

Classic Bánh Mì Torpedo (recommended)

Eight inches, fat through the middle, tapered at both ends.

1. Flatten. Working one piece at a time and keeping the rest covered, press the log gently into a rough 5 by 6 inch rectangle. Push out the big bubbles but leave the small ones.
2. Fold and seal. Fold the top edge to the center and seal it with the heel of your hand. Fold the new top edge to the center and seal again. You are building tension in layers, not in one motion.
3. Fold in half and seal the seam. Fold the whole thing lengthwise onto itself and press the seam closed along its full length. Press firmly. An unsealed seam will blow open in the oven and you will get a second ear where you did not want one.
4. Roll out to length. Seam side down, both hands in the center, roll back and forth with light outward pressure until it reaches 8 inches. Ease off in the center and press harder at the ends so it tapers. The middle stays fat. That silhouette is the signature.
5. Check the tension. Run a fingertip along the top. It should feel taut, like the skin of a drum, with no slack or wrinkles. Slack surface means no ear, no matter how well you score.

Short Roll, for sandwiches on soft rolls

Six inches, blunter ends. Easier, and it holds a wetter filling.

1. Same folds, less rolling. Follow the same fold and seal sequence, then roll out only to about 6 inches and leave the ends rounded rather than tapered.
2. Score the same way. One shallow slash. The technique does not change with the length.

Proof test: Floured fingertip pressed into the side leaves a dent that fills back slowly and not completely. Springs right back means underproofed. Stays fully dented means overproofed, so bake it now.

Bake with Steam

Hot and wet for the first ten minutes, then hot and dry. That two-stage bake is what makes the crust shatter instead of soften.

Oven: 245°C / 475°F. Internal temperature when done: 96-99°C / 205-210°F.

Sheet Pan with a Steam Pan (recommended)

The way these are actually baked.

Equipment: Half-sheet pan, metal pan on the bottom rack, spray bottle

1. Preheat hard. 475°F (245°C) with a rack in the middle and an empty metal pan on the bottom rack. Give it a full 45 minutes. Thirty is not enough for a bake this short, and an underheated oven is the number one cause of a pale, soft bánh mì.
2. Score. One cut. Hold the lame almost flat against the loaf, no more than about 20 degrees off the surface, and draw a single slash down the length just off center, about ¼ of the way in from the midline. Depth is roughly ⅛ inch, not ¼. You are lifting a flap of skin, not cutting a trench. This is scoring for an ear, and it is the whole technique.
3. Load and steam. Slide the sheet onto the middle rack. Pour 1 cup of boiling water into the hot pan below and shut the door immediately. Keep your face back and your arms clear.
4. Bake wet, then dry. Ten minutes with steam. Then pull the steam pan out, crack the door for three seconds to vent, and bake another 8 to 12 minutes until deep golden with a shine on the crust.
5. Check the temperature. 205 to 210°F (96 to 99°C) in the center. Tapping the bottom tells you very little on a roll this small. Use the thermometer.
6. Cool and listen. Straight to a wire rack. Stand there for a minute and listen. A properly baked bánh mì crackles audibly as it cools. That sound is the crust contracting and fracturing, and it is the best doneness signal you will get.

Baking Steel or Stone

A little more bottom heat, a little more lift.

Equipment: Baking steel or stone, parchment, metal pan for steam

1. Preheat 1 hour. Steel or stone on the middle rack at 475°F (245°C) for a full hour. Steam pan below.
2. Slide and steam. Slide the rolls on their parchment directly onto the steel, then add the boiling water to the steam pan.
3. Same two-stage bake. Ten minutes wet, then vent and finish 8 to 10 minutes. Watch them a little closer, the bottoms color faster on steel.

Dutch Oven

Not for this bread.

1. Why not. An 8-inch roll does not fit a Dutch oven in any useful number, and you would bake one roll at a time over six rounds. More importantly, a Dutch oven traps steam for far too long. Bánh mì needs the steam cut off at ten minutes so the crust can dry out and go thin. Use a sheet pan and a steam pan.

Note: Squeeze a cooled roll. It should compress almost flat and spring back, and the crust should crackle under your hand. If it feels solid, the crumb is too dense, and the fix is usually a hotter oven or a shorter bulk.

Storage

• Room temperature: Best within 4 hours of baking. Up to 1 day loosely wrapped in paper, never plastic.
• Refrigerated: Not recommended. The fridge stales lean bread faster than the counter does.
• Frozen: Up to 1 month in a zip-top bag. Freeze them the day you bake them, not after they have gone stale.
• Refresh: Mist with water and bake at 400°F (205°C) for 4 to 6 minutes, straight from frozen. The crust comes back almost completely.

Frequently Asked Questions

Can I skip the rice flour?

You can, and you will get a nice small sourdough baguette. You will not get a bánh mì. The rice flour is what makes the crumb tear and stay light and the crust stay thin. If you have none, replace it gram for gram with all-purpose and expect a chewier roll. Use white rice flour when you buy it, not sweet or glutinous rice flour, which is a different starch and turns the crumb gummy.

Do I need a dough conditioner or vitamin C like the bakeries use?

No. Vietnamese bakeries run fast straight doughs with no preferment, and a conditioner is how they get volume and crust out of a dough that has not had time to develop. You have a levain sitting overnight doing that work instead. Adding an oxidizer on top of a long ferment pulls in the opposite direction, tightens the dough, and makes shaping harder. Skip it.

My crumb came out dense instead of cottony. What happened?

Almost always one of three things. Your oven was not hot enough or not preheated long enough, so the rolls never got the burst of expansion. Your bulk ran too long and there was no gas left for oven-spring. Or your levain was past peak when you mixed. Run the float-test next time and watch for 50 to 70 percent growth in bulk, not double.

My slash dragged and tore instead of opening an ear.

Two causes. The blade was too steep, or the dough was too warm and soft. Hold the lame nearly flat, about 20 degrees off the surface, and go shallow, around ⅛ inch. And score straight from the fridge. A cold, firm skin cuts cleanly. A room-temperature roll grabs the blade and drags.

How is this different from the yeasted version?

Same 63% hydration, same 2% salt, same 5% sugar, same 144g roll. The only real difference is what is doing the lifting and how long it takes. The yeasted one goes overnight poolish to bake in about 6 hours the next day. This one takes a day and a half and gives you a deeper, wheatier flavor with a faint tang underneath. Bake them a week apart and you will taste exactly what your starter contributes, because nothing else changed.

Can I bake these the same day instead of retarding?

Yes. Proof the shaped rolls 1½ to 2½ hours at room temperature until they are about 1½ times their size. Then chill them uncovered for 20 minutes before scoring. Even that short chill firms the skin enough to give you a cleaner cut.

What do I put on them?

Do chua is the non-negotiable part. Julienne a carrot and a piece of daikon, toss with 1 tablespoon sugar and 1 teaspoon salt, let them sweat 15 minutes, squeeze out the liquid, then cover with equal parts rice vinegar and water plus a spoonful of sugar. Ready in an hour, better the next day, keeps three weeks. After that: mayonnaise, a smear of pâté if you have it, cucumber spears, cilantro, sliced jalapeño, a few drops of Maggi or soy, and whatever protein you like. Roast pork, grilled chicken, cold cuts, fried egg, or crisped tofu all work.

Nutrition

Per serving (1 roll): 255 calories, 50g carbohydrates, 7g protein, 3g fat, 2g fiber, 650mg sodium. Makes 6 servings.