Cut bell peppers in half lengthwise and remove seeds and membranes. Mince the onion and microwave it in a heatproof container for 1 minute at 600W.

Mix ketchup and Worcestershire sauce in a bowl to prepare the sauce.

Combine ground meat, minced onion, and seasonings (salt, pepper, potato starch, mayonnaise) in a bowl. Mix until sticky and divide into 6 portions.

Sprinkle flour inside the bell peppers and stuff them with the meat mixture.

Heat salad oil in a frying pan over medium heat. Place the stuffed peppers meat-side down and cook until browned. Flip, cover, and cook on low heat for 4–5 minutes until fully cooked.