Preparation : Sift flour in a large bowl. Add salt; mix well. Make a hole in center. Add egg and vinegar. Blend in warm water and 1 1/2 tablespoons of oil gradually, mixing throughly. Knead for 7-8 minutes or until smooth to make a medium soft dough. Divide into 11 portions, 1 larger than the others. Shape into balls. Cover with a damp napkin. Let stand for 10 minutes. For fılling: Brown ground meat and fınely chopped onion for 10 minutes or until meat is crumbly; drain. Season with salt and pepper; mix. Set aside. Roll large ball into a circle 65 cm (26 1/2 inch), others into circles 60 cm (24 1/2 inch) in diameters, all 0,5 mm thick. Pack all layers on top of each other with larger one on bottom. Spread filling into an oblong 25x30 cm (10x12 inch) over top layer in center. Fold opposite edges of first sheet over fılling on both sides. Keep folding one by one but little larger than previous one each time until sixth layer. Brush each layer wıth oil while folding. When fıfth layer is folded like an bundle turn bundled part up-side down. Repeat same with remaining layers. Arrange on an oiled baking pan turning up-side down again. Cut into 12 oblongs with a pizza cutter. Cut oblongs into triangles. Heat remaining oil. Sprinkle over böreks. Bake in a moderate oven for 30 minufes or until golden. Serve warm.
Good Apetite.