* To make sour milk, place 2 teaspoons vinegar in measuring cup and fill to 2/3 cup mark with milk. **Or finely chopped. Break eggs into a bowl; beat well. Stir in buttermilk, 1/2 cup sugar, orange peel and raisins. Add Mix and soda. Beat well. Pour into an 8 by 8 by 2-inch pan, bottom rubbed with shortening. Bake in a 350 F. oven about 30 minutes. Combine orange juice and 1/4 cup sugar, stirring to dissolve sugar. Pour over hot cake. Cool. Yield: One 8-inch square cake