Coconut Pecan Frosting (for German Chocolate Cake)

1 cup evaporated milk
1 cup sugar
3 egg yolks
¼ pound margarine
1 tsp. vanilla
1 ¹/₃  coconut
1 cup chopped pecans 

Combine milk, sugar, yolks, margarine, and vanilla. Cook in a saucepan for 12 minutes. Remove from heat. Stir in coconut and pecans. Beat until thick enough to spread.