Buttermilk Discard Biscuits: Lamination With Cold Butter, 90 Minutes Start to Finish

Ingredient	Amount	%
Bread flour	600 g	60 %
Other flour	400 g	40 %
Water	680 g	68 %
Sourdough starter	350 g	35 %
Salt	18 g	1.8 %

Ingredient

Amount

Bread flour

600 g

60 %

Other flour

400 g

40 %

Water

680 g

68 %

Sourdough starter

350 g

35 %

Salt

18 g

1.8 %

Shaping	cut rounds 5 cm, straight down with a floured cutter, no twisting
Scoring	none, the split happens on its own
Bake curve	215 °C, 0 min steam, 16 min
Crumb rating	3/5 · 20% · flaky layers, visible butter streaks

Shaping

cut rounds 5 cm, straight down with a floured cutter, no twisting

Scoring

none, the split happens on its own

Bake curve

215 °C, 0 min steam, 16 min

Crumb rating

3/5 · 20% · flaky layers, visible butter streaks

Biscuits are the fastest thing in this ledger: 90 minutes from cold jar to hot tray, and the only leavening is 105 g of three-day-old discard plus the steam from cold butter. The trick is that discard is acidic, and acid plus baking soda in the right ratio gives a lift that yeast cannot match in that window.

The ratio that matters

For every 120 g of flour, 3 g of baking soda. More and the biscuits taste of soap; less and they do not rise. Buttermilk adds its own acid, so the total is 3 g soda to 180 g buttermilk plus 105 g discard. Mix the soda into the dry flour first so it disperses evenly.

Ingredient	Weight	Note
Bread flour	120 g	12% protein
Cake flour	80 g	Lower protein keeps it tender
Cold butter	90 g	Frozen 15 min, cut into 1 cm slabs
Baking soda	3 g	Sifted with the flour
Buttermilk	180 g	Cold
Discard	105 g	Straight from the fridge
Salt	4 g	Fine sea salt

Lamination with cold butter, not cutting

Instead of cutting butter into flour with a pastry blender, I fold the dough three times over slabs of cold butter, five minutes apart. The butter stays in distinct sheets, and when those sheets hit a 215 °C oven the water in them flashes to steam and pushes the layers apart. A pastry blender gives you coated flour particles and, at best, a crumbly biscuit.

Cutting and baking

Pat the dough to 2.5 cm and cut 5 cm rounds with a floured cutter, straight down, no twisting. A twisted cutter seals the edges and the biscuit rises lopsided. Bake at 215 °C for 16 minutes on the middle rack; the tops should be golden and the sides should show visible horizontal splits.

Do not re-roll scraps more than once; the second pass is noticeably tougher.
Brush the tops with buttermilk, not egg, so the crust stays soft.
Best eaten within 20 minutes, but they revive at 150 °C for 5 minutes the next day.

The discard must be at least two days old and smell cleanly sour. Discard that has been fed the same morning has no acidity left, and the soda will have nothing to react with.

Questions that came up

Can I use baking powder instead of soda?

Not the same, because baking powder brings its own acid and this dough already has plenty. If you only have powder, use 8 g and drop the buttermilk for milk, but the rise will be flatter and the flavour less tangy.

Why did my biscuits spread instead of rising?

The butter was too warm or the dough was handled too long. Everything — butter, buttermilk, discard — should come out of the fridge cold, and the whole process from first fold to the oven should take under 25 minutes.