Pirozhki(Russian) - cooking recipe

Ingredients

2 c milk
3 eggs
1 c sugar
1 tsp salt
2 sticks butter or margarine
50 gram. yeast
6 1/2 c flour (unbleached)

Preparation

DOUGH:
Mix warm milk with yeast, add salt and sugar, and 3 cups flour, 1 cup at a time.
Beat eggs in a bowl, stir eggs into mixture, warm up butter, stir into dough, add 1 Tbsp of vegetable oil.
Mix about 15 minutes, if dough seems liquid, add a little bit more flour.
Put dough into a big pot and cover.
Keep it in a warm place for 5 hours.