1 cup milk with 1 tbsp. vinegar (or 1 cup sour milk)
2 cups unsifted flour
3 tbsp. sugar
1 tsp. salt
1/2 tsp. baking soda
1/3 cup shortening
1/2 cup chopped raisins
1 egg yolk, beaten
Sugar

Combine flour, sugar, salt and baking soda. Stir well to blend. Cut in shortening to fine consistency. Add milk all at once and stir with fork until moistened. Turn out onto a floured board and knead gently about 20 times. Pat or roll out to a 1/2" thick circle. Cut into 8 wedges but do not separate. Brush with egg yolk and sprinkle with sugar.
Bake at 450F for 12-15 minutes.