Chocolate Beer Cake - Chokoladekage

1/3 cup soft butter
1 cup sugar
2 egg yolks
2 unsweetened chocolate squares
1 3/4 cups flour
1 teaspoon baking powder
1/2 teaspoon baking soda
1/2 teaspoon salt
3/4 cup beer
2 egg whites

Cream butter, add sugar slowly and beat well. Add the egg yolks one at a time, beating well after each addition.

Add the chocolate which has been melted over low heat and cooled. Beat until smooth.

Sift together three times the flour, baking powder, soda and salt. Add to the butter alternately with the beer, a little at a time, and blend well.

Beat the egg whites until stiff but not dry and fold in.

Bake in a buttered loaf pan (9×5×3) about 30 minutes in a preheated 375º oven plain or frost with a frosting.