2 hr 15 min — Medium — British
Equal weights of butter, caster sugar, and flour at 285 grams each produce two light sponge layers that bake in about 25 minutes. Four hundred milliliters of thick double cream whips with icing sugar and spreads over the bottom tier along with raspberry jam before the top layer goes on. Dust with extra icing sugar before serving. At 30 portions, this is scaled for a large table or celebration rather than a small household.