2 envelopes Knox gelatin, soak and set aside. Then bring 1 quart milk to scalding point. Beat 1 egg and 3/4 cup sugar and add to milk in a double boiler. Boil 10 minutes, stirring. Add 1 tablespoons vanilla. Pour gelatin into hot mixture. Cool in refrigerator overnight. Next day, whip 1/2 pint double cream, whip gelatin mixture and fold cream in. Serves 8.