Steps
1. In a bowl, mix ground beef, chopped onion, salt, and pepper thoroughly.
2. Roll out the dough into a thin circle about 15cm in diameter.
3. Place the meat mixture on one half of the dough, leaving a small border.
4. Fold the dough over the filling and press the edges firmly to seal.
5. Heat vegetable oil in a frying pan over medium heat.
6. Fry the cheburek for 3-4 minutes on each side until golden brown and crispy.
7. While frying, prepare the sauce by mixing tomato paste, water, vinegar, sugar, garlic, salt, and pepper in a small bowl.
8. Stir in chopped parsley and adjust seasoning as needed.
9. Drain the cooked cheburek on paper towels.
10. Serve the cheburek on a plate with the tangy tomato sauce on the side for dipping.