Soak gelatine in cold water. Warm the milk.
Cream together egg yolks, half the sugar, and coffee. Pour on warm milk, stirring constantly; return to heat and cook gently until custard just coats the spoon. Cool. Dissolve gelatine over gentle heat; stir into cooled coffee custard. Fold in whipped cream.
Whisk egg whites with salt until stiff but not dry; then whisk in remaining su