Beat egg yolks until creamy, adding the 1/2 cup sugar gradually. Add lemon juice.
Put in top of double boiler and cook until thick, stirring constantly. Whip 3 egg
whites until stiff. Add the 4 tablespoons sugar. Add beaten egg whites to yolk mixture.
Whip cream until thick and add to egg mixture. Mix well.
Crush vanilla wafers.
Put layer of custard in flat 2-quart casserole. Cover with layer of cracker crumbs and