Casserole Onion Bread

1 cup milk, scalded
3 Tbsp. sugar
1 1/2 Tbsp. shortening
2 tsp. salt
1 cup lukewarm water
2 pkgs of active dry yeast
4 1/2 cups all purpose flour
1 tsp. onion salt
3/4 cup coarsely chopped onion
2 Tbsp. butter
1 egg yolk, beaten
1 tsp. water

Mix scalded milk, sugar, shortening, and salt. Dissolve yeast in the cup of lukewarm water and add to milk mixture when milk has cooled. Add the teaspoon of water to the egg and beat well. Add two tablespoons of butter, chopped onion and mix in with the milk mixture. Add onion salt to flour, sift and slowly mix well. Bake in a greased loaf pan for one hour in a 375 degree oven.