1. Cut potato green pepper and carrot into short and thin strips. Slice the onion.
2. Heat sesame oil in a frying pan, and fry onion until fragrant. Add potato and carrot, and stir-fry until browned (2 minutes). Add green pepper and stir-fry for 30 seconds.
3. Add A in the pan and stir-fry until the seasonings blend.
4. Serve hot