Prepare ingredients, chop onions, peel and chop tomatoes, stir-fry minced garlic, minced onion and pepper, stir-fry tomatoes until thick, add black pepper salt, pick out the pepper and put it into a cooking machine to break. Cut the potatoes into pieces, cook for 8 minutes until cooked, fry them in a non-stick pan until golden brown, take them out, add tomato sauce and sprinkle with a little black pepper.