Grilled Pork Chops with Classic Barbecue Sauce

heat the oil in a frying pan and sauté the onion and garlic until soft and lightly browned, 4-5 minutes. Grate the zest from the lemon and squeeze the juice. Add the lemon zest, half the lemon juice, the sugar, vinegar, ketchup, Worcestershire sauce, Tabasco sauce and chili powder to the onion and simmer gently, 5 minutes. Taste, adjust the seasoning and let cool. Light the grill. Season the pork chops with salt and pepper and brush with the cooled barbecue sauce. Grill them, basting often, 5-7 minutes. Turn over and continue grilling and basting until the chops are done, 5-7 minutes longer.