Sponge Cake Chocolate Espresso

In England it is not customary to invite guests to dinner. Usually, guests come for tea. And these tea parties involve a full table of all kinds of food. But traditionally, biscuits are always present. I offer you a culinary recipe for chocolate sponge cake "Espresso".
First we warm up the oven. Grease the molds with fat and lightly sprinkle with flour.
Put chocolate and butter in a saucepan. Melt them together over low heat, stirring constantly. Then we set aside to cool down.
In a large bowl, mix eggs, sugar and vanilla. Place the bowl on a pot of boiling water, so that the bowl with the mixture is five centimeters above the surface of the water. And warm the mixture over low heat, stirring until it becomes warm. Remove from the heat and whisk in a mixer. Beat for about 15 minutes, until the mixture triples in volume.
Carefully pour flour into it, no more than a third of a glass at a time. Then, as gradually, pour in the chocolate with butter. Pour evenly into molds, and bake until ready. Readiness can be checked with a toothpick. Cool in the mold for 10 minutes, and then take out the biscuit and let it cool completely.
Such a biscuit is served to the table with vanilla ice cream.