Prague cake chocolate buttercream cake

329kcal / slice

24 slices · 10.0 cm tall · 2.00 kg ?

How is this counted?

A slice is a wedge with about 16 cm² of top — a party slice about 2.5 cm wide at the rim.
Ø 22 cm tin → 380 cm² ÷ 16 = 24 {wslices}.
Height does not add slices, it makes each one heavier: 83 g and 329 kcal a slice here.
Each layer weighs area × thickness × its density; calories are that weight × kcal per 100 g, summed over all layers.

Sponge layers3

TinØ 22 cm

Guests24

moving this resizes the tin

Layers top first

Chocolate sponge: Bake 25–30 min at 170 °C fan.
Condensed-milk buttercream: Butter and condensed milk must both be at room temperature.
Dark ganache: Pour hot cream over the chocolate, rest 2 min, stir. Use at 32 °C.