Slice the onion thinly. Cut the red bell pepper in half lengthwise, remove seeds and stem, and chop into bite-sized pieces. Mince the garlic.

Heat salad oil and garlic in a frying pan over medium heat until fragrant. Add ground meat and stir-fry until the meat changes color.

Add the onion and stir-fry until softened. Then add the red bell pepper and stir-fry briefly.

Add the seasoning ingredients (sake, salt, pepper, water) and mix well. Cover with a lid and simmer over medium heat for 7 minutes.