1Prepare dough: In a large bowl, dissolve yeast in warm water. Let stand until creamy, about 10 minutes. Mix in sugar, margarine, egg, salt and 1/2 of the flour. Beat until smooth; add remaining flour until dough pulls together. Place in oiled bowl. Cover with foil and refrigerate for 2 hours or overnight, OR let it rise for 1 hour.
2In a large heavy skillet, brown meat. Add onion, cabbage, salt and simmer 30 minutes. Cool until lukewarm. Preheat oven to 350 degrees F (175 degrees C.) Coat a cookie sheet with non-stick spray.
3Punch down dough and divide into 20 pieces. Spread each piece of dough out on an un-floured surface and fill with approximately 2 tablespoons filling. fold dough over and seal edges. Place on prepared cookie sheet and let rise for 1 hour.
4Bake in the preheated oven for 25 minutes, or until golden brown. Brush with butter and serve.