Thin pancakes with holes on sour milk (+Cooking video)

Thin pancakes with holes on sour milk is the classic Russian "blini" preparation that produces dramatically lacy thin pancakes with hundreds of small holes across the surface. The chemistry: sour milk's natural acid + baking soda produces vigorous CO2 reaction that creates the bubbles → holes during cooking. The 60-minute total preparation includes 20 minutes of dough rest (improves texture). Yields 13 pancakes from 1 cup each of milk + flour + boiling water — generous family-size batch. Perfect for breakfast, dessert with jam/honey, or filling with savoury or sweet stuffings for stuffed pancakes.

Ingredients

Preparation

Cooking video

Tips and Tricks

Tip 1. THE BOILING-WATER ADDITION CREATES THE HOLES. Step 7's "boiling water into the rested dough" is the recipe's signature technique. Cold-water versions: weak reaction, few holes. Hot-water versions: vigorous CO2 release, dramatic holes. The 1 cup boiling water also doubles the batter's volume — produces thinner pancakes from the same flour quantity. Same hot-water-shock principle works in many "lacy pancake" traditions worldwide. Pour boiling water IMMEDIATELY (not lukewarm) for maximum hole formation.

Tip 2. THE 20-MINUTE REST IS NON-NEGOTIABLE. Step 6's rest period serves two purposes. First: gluten relaxation (produces tender pancakes vs tough). Second: initial soda-acid activation (the soda starts reacting with sour milk's acid during the rest, building bubble structure). Without rest: tougher pancakes with fewer holes. With rest: tender + lacy. The 20-minute timing is calibrated. For another whey-based pancake variation worth comparing, see Pancakes with kefir and milk with holes (thin).

Tip 3. THE FIRST-SIDE-LONGER TIMING. Step 9-10's "1.5 minutes first side, 30-40 seconds second side" timing is precision. The first side develops hole pattern + golden colour (longer cooking); the second side just finishes the cooking + brief golden touch (shorter). Equal-time-both-sides: produces over-cooked dry pancakes. The asymmetric timing preserves the hole-pattern aesthetic AND optimal moisture. Same principle applies to most pancake/crepe traditions worldwide.

Tip 4. THE NATURALLY-SOURED-MILK ADVANTAGE. The recipe's "milk soured without commercial starter" instruction is precision. Naturally soured milk: complex bacterial cultures from environment, deeper flavour, varied acidity. Commercial buttermilk/kefir: standardised but slightly less complex. Both work; natural produces marginally better pancake flavour. To make sour milk: leave fresh milk on counter 1-2 days until thickened + tangy. Don't use commercial preservative-treated milk (won't sour properly). Russian/farm-style fresh unhomogenised milk sours fastest. For another mineral-water pancake variation worth trying, try Pancakes on Mineral Water and Milk.

Frequently Asked Questions

Can I substitute kefir for sour milk?

Yes — kefir is the most direct substitute. Use the same 1 cup quantity. Kefir produces nearly identical results: similar acidity for soda reaction, similar texture in finished pancakes. Other working substitutes: buttermilk (excellent), thick yogurt thinned with water (good), regular milk + 1 tbsp lemon juice (acceptable, "soured" within 5 minutes). The sour-acid component is what matters; specific dairy form is flexible. Avoid: regular milk alone (no acid, won't react with soda properly).

Why don't I see the holes during cooking?

Three common causes. First: pan not hot enough (bubbles dissipate before forming holes). Solution: pre-heat thoroughly; test with small drop of batter (should sizzle vigorously). Second: insufficient soda or wrong soda (some "baking soda" products are weaker than others). Solution: ensure full 1 tsp level baking soda from fresh package. Third: insufficient acid in the milk (not actually soured). Solution: ensure milk has tangy taste before using; if not, add 1 tbsp white vinegar or lemon juice. Fourth: batter too thick. Solution: ensure batter flows in thin stream from ladle.

Can I make these savoury?

Yes — easily. Reduce sugar to 1 tsp (just enough to balance the savoury character without making the pancakes sweet). The pancakes themselves are neutral when modified — pair with savoury fillings: minced meat + onion, mushrooms + cheese, smoked salmon + cream cheese, scrambled eggs + bacon. The savoury filled pancakes (Russian "blinchiki") are a classical Russian/Eastern European preparation. The thin lacy texture works beautifully for both sweet and savoury filling applications. Make a triple batch + freeze; use for stuffed pancakes throughout the week.

How do I store and reheat?

Refrigerated stack: 3-4 days. Freeze for 3 months (use parchment between each pancake). Reheating options: brief microwave (10 seconds per pancake), dry skillet 15 seconds per side (no oil — refreshes texture), oven 5 minutes at 150 °C for whole stack. Don't reheat in oil (drys + adds unnecessary fat). Pancakes for filling applications: reheat briefly first, then fill while warm + flexible. Cold pancakes are too rigid to roll without cracking.