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- 1 cup sugar
- 3 tablespoons flour
- juice and zest of 1 lemon
- 2 eggs, separated
- 1 tablespoon butter
- pinch of salt
- 1 cup milk
- Slightly beat egg yolks.
- Mix the sugar and flour together and add the lemon juice and zest, yolks, butter and salt.
- Stir in the milk and mix well.
- Beat the egg whites until stiff and fold into the first mixture.
- Pour into custard cups (or ramekins).
- Set the cups in a pan of hot water and bake at 350°F for about 40 minutes.
Tips, Notes, and Variations
- The sponge may also be baked in a pie shell.