Whole Wheat Hamburger Buns

Ingredients

1 1/4 cups warm water
3/8 cup mild oil
1/4 cup sugar
2 packages yeast
2 scant
4 teaspoons salt
1 egg yolk
2 1/2 cups wheat flour
1 cup bread flour
1 melted butter
4 packages in diameter with a cutter

Instructions

YIELD: 10 buns