Chocolate Marshmallow Pie — in the bird's milk tradition
Chocolate marshmallow pie is a chilled dessert of three layers: a crunchy chocolate-biscuit base, a thick layer of soft, homemade vanilla marshmallow soufflé, and a glossy dark chocolate glaze. This version follows the Eastern European 'bird's milk' tradition — Polish ptasie mleczko and Russian ptichye moloko — in which an airy, marshmallow-like soufflé is set under chocolate.
i. Origin & history
'Bird's milk' is an old expression in several Slavic languages (and in Greek) for something impossibly rare or luxurious — the one thing a person who has everything still lacks. In Poland, the Warsaw confectioner E. Wedel used the name in the 1930s for a new sweet: small squares of very soft, marshmallow-like vanilla soufflé coated in chocolate, called ptasie mleczko. The sweet became one of Poland's best-known confections and has been widely imitated ever since.
In the Soviet Union the idea was taken in a new direction. The Ptichye moloko cake, created at the Praga restaurant in Moscow in the late 1970s under the confectioner Vladimir Guralnik, set a thick, light soufflé on a thin sponge and covered it in chocolate. Reportedly it was one of the first Soviet cakes to be patented, and it was in such demand that people queued for it. Home bakers across the Soviet bloc created their own versions, often with gelatin instead of agar and biscuit crumbs instead of sponge.
Chocolate marshmallow pie, as made in many Polish, Ukrainian and Russian homes and in the diaspora, is that home version: an easy crumb base, a gelatin-set marshmallow soufflé made by whipping egg whites with hot sugar syrup, and a simple chocolate glaze. It is a celebration dessert that needs no oven for the filling and makes ahead well.
The pie is a cousin to the American chocolate-marshmallow combinations — s'mores, Mississippi mud pie and rocky road — but its filling is gentler and more refined: a vanilla soufflé rather than a pile of store-bought marshmallows. For a marshmallow-studded frozen treat, see rocky road ice cream, and for marshmallow toasted into fudge, toasted marshmallow fudge.
ii. How a hot syrup turns egg whites into marshmallow
Homemade marshmallow is an Italian meringue set with gelatin. Egg whites are whipped while a sugar syrup is boiled to about 117°C, the 'soft ball' stage, when most of the water has evaporated. Poured in a thin stream into the whipping whites, the hot syrup cooks and stabilises them, producing a dense, glossy, stable foam that will not collapse or weep the way an uncooked meringue does.
Dissolved gelatin is then whipped in. As the mixture cools, the gelatin sets the foam, trapping the air bubbles in place. The result is the soft, springy, melt-in-the-mouth texture of marshmallow, but lighter and more delicate than a cut marshmallow because it is set in a thick layer and eaten chilled. A little glucose or golden syrup in the sugar syrup prevents crystallisation and keeps the soufflé smooth.
Timing is the only tricky part. The soufflé must be poured onto the base while it is still warm and fluid — once it cools below about 30°C the gelatin begins to set and it becomes difficult to spread smoothly. The glaze, on the other hand, must wait until the marshmallow is fully set and cold, and must itself be only lukewarm, or it will melt the top of the soufflé.
The original Russian cake used agar rather than gelatin, which gives a firmer, slightly more fragile set and sets at a higher temperature; gelatin is easier at home and gives a softer, bouncier texture.
iii. Ingredients
Makes 10 servings · scroll the side panel to adjust
- 250 g chocolate digestive or cocoa biscuits
- 90 g unsalted butter, melted
- 12 g powdered gelatin (or 6 leaves)
- 80 ml cold water (gelatin)
- 250 g caster sugar
- 80 ml water (syrup)
- 50 g glucose or golden syrup
- 3 egg whites, room temperature
- 1 pinch of salt
- 2 tsp vanilla extract
- 1 tsp lemon juice
- 120 g dark chocolate (60–70%)
- 80 ml double cream
- 20 g butter (glaze)
Any crisp chocolate biscuit works for the base; plain digestives with a spoon of cocoa are fine too. Use fresh egg whites — the hot syrup cooks them, but they should be free of any trace of yolk or they will not whip. A sugar thermometer makes the syrup reliable. Gelatin can be swapped for 4 g agar powder boiled in the water for the original-style firmer set (pour it into the meringue straight away, as agar sets fast). A good dark chocolate balances the sweet filling.
iv. Method
- Line the base of a 22 cm springform tin with baking paper. Crush the biscuits to fine crumbs, mix with the melted butter and press firmly into the base. Chill.
- Sprinkle the gelatin over the 80 ml cold water and leave for 10 minutes to swell.
- Put the sugar, 80 ml water and glucose in a small pan and heat, stirring, until the sugar dissolves. Stop stirring and boil to 117°C (soft-ball stage), about 6–8 minutes.
- When the syrup reaches about 110°C, start whisking the egg whites with the salt in a stand mixer to soft peaks.
- With the mixer running, pour the hot syrup in a thin stream down the side of the bowl. Whisk on high for 3 minutes until thick and glossy.
- Melt the gelatin gently (a few seconds in the microwave or over warm water) until liquid, then pour it into the meringue with the vanilla and lemon juice. Whisk for 5–7 minutes more until the bowl is just warm and the mixture thick, white and fluffy.
- Spread the warm marshmallow over the biscuit base, smooth the top and chill for at least 3 hours until set.
- For the glaze, heat the cream until steaming, pour over the chopped chocolate and butter, wait 2 minutes and stir until smooth. Cool to lukewarm, pour over the set marshmallow and tilt to cover. Chill for 30 minutes, then release from the tin.
v. Tips & common mistakes
- Use a thermometer. Under-boiled syrup gives a soft, weeping filling; over-boiled syrup can harden into strands when it hits the whites.
- Pour the syrup down the side. Syrup that hits the whisk is flung onto the bowl walls and sets there instead of cooking the whites.
- Work fast once the gelatin goes in. Spread the marshmallow while it is still warm and pourable.
- Press the base firmly. A loose crumb base crumbles when you cut; a flat-bottomed glass helps compact it.
- Glaze only a lukewarm ganache. Hot glaze melts the top of the marshmallow and leaves a messy surface.
- Cut with a hot, wet knife. Marshmallow drags and sticks to a dry blade; dip and wipe between slices.
vi. Variations
Bird's milk cake replaces the biscuit base with a thin butter sponge and often adds butter and condensed milk to the soufflé for a creamier result. Lemon or orange marshmallow pies add zest and juice to the soufflé; chocolate marshmallow folds in cocoa. In Poland, layered ptasie mleczko cakes sometimes add a layer of jelly with fruit on top. A no-egg version beats gelatin with hot syrup alone, as for classic marshmallows.
For other Eastern European celebration cakes, see Napoleon cake and medovik; for a no-bake chocolate classic, try the chocolate salami.
vii. Serving & storage
Serve the pie cold, in wedges, straight from the fridge, with tea or coffee. It is a birthday and holiday dessert in many Polish and Russian homes, and its contrast of crunchy base, cloud-like middle and snapping chocolate is best enjoyed chilled.
Keep it covered in the fridge for up to 4 days. The base softens slightly over time. It can be frozen, without the glaze, for up to a month; thaw overnight in the fridge and glaze before serving. Do not leave it in a warm room for long, as the gelatin softens.
viii. Common questions
What is chocolate marshmallow pie?
A chilled dessert of a chocolate-biscuit base, a thick layer of soft vanilla marshmallow soufflé set with gelatin, and a dark chocolate glaze. This version follows the Eastern European bird's milk style.
What is bird's milk cake?
Bird's milk, ptichye moloko in Russian and ptasie mleczko in Polish, is a soft vanilla soufflé covered in chocolate. As a cake it was created at the Praga restaurant in Moscow in the late 1970s; the Polish sweet of the same name dates from the 1930s.
Why is it called bird's milk?
'Bird's milk' is an old expression for something impossibly rare or luxurious, since birds do not make milk. The name suggests a treat so fine it seems almost unattainable.
Can I use shop-bought marshmallows?
Yes, for a quicker version: melt about 250 g marshmallows with 60 ml milk, cool slightly and fold in 250 ml whipped cream, then spread on the base and chill. The texture is denser and sweeter than homemade soufflé.
Is the egg white cooked?
Yes. The sugar syrup at 117°C heats the whites as it is whipped in, making an Italian meringue. Use fresh eggs, and avoid serving to anyone who must strictly avoid lightly cooked eggs.
How long does chocolate marshmallow pie keep?
Up to 4 days covered in the fridge. It can be frozen without the glaze for a month.