Preheat oven to 375° F.
Brown hamburger and onion. Drain. Stir in barbecue sauce. On ungreased cookie sheet, arrange crescents as 4 long rectangles. Press edges and perforations together. Spread meat mixture lengthwise in a 4-inch wide strip down the center of crescent dough. Top meat mixture with cheese. Cover with crescent. Pinch to close off.
Sprinkle with sesame seed. Bake for 20 to 25 minutes or until golden brown.Servings: 4