Mix the yeast, sugar, sat, warm water, oil, vinegar, and flour together. Let rise 1 hour. Punch down. Let rise 45 minutes. Roll out to about 1/16″ thick. Saute garlic and onions; add ground beef and fry until browned. Add cabbage and fry until tender (tastes better if cabbage is browned well). Salt and pepper to taste. Cut the dough into 5×5″ squares and put a generous portion of the beef mixture on the middle of each square. Gather all 4 corners together and pinch shut each diagonal seam toward the center. Turn upside down on a baking sheet. Bake for 20 minutes at 400 degrees. Brush with butter when they come out of the oven.