Sufficient to spread between three 9-inch layers.
Combine sugar, flour and salt. Add milk or cream and stir until smooth and thick. Pour over eggs. Stir and cook the custard in a double boiler until the eggs thicken. Cool and add vanilla, almonds and sherry.
Variation: Banana Custard Filling: Before spreading the custard, add 2 or more thinly sliced bananas.