Chocolate mousse cake chocolate sponge and mousse

268kcal / slice

20 slices · 9.5 cm tall · 1.54 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 20 cm tin → 314 cm² ÷ 16 = 20 {wslices}.
Height does not add slices, it makes each one heavier: 77 g and 268 kcal a slice here.
Each layer weighs area × thickness × its density; calories are that weight × kcal per 100 g, summed over all layers.

Sponge layers2

TinØ 20 cm

Guests20

moving this resizes the tin

Layers top first

Chocolate sponge: Bake 25–30 min at 170 °C fan.
Chocolate mousse: Fold whipped cream into cooled chocolate; set at least 4 h in the fridge.
Dark ganache: Pour hot cream over the chocolate, rest 2 min, stir. Use at 32 °C.