
Slice the leftover steak into bite-size strips. Cut the celery, long hot pepper, mini sweet peppers, and onion into thin, even pieces, then mince the garlic.

Heat the cooking oil in a wok or large skillet over medium-high heat. Add the steak and stir-fry for about 30 seconds, just until warmed and lightly coated with oil.

Add the celery, peppers, and onion. Stir-fry for 2 to 3 minutes, tossing often, until the vegetables are bright and slightly tender but still crisp.

Add the garlic, soy sauce, oyster sauce, salt, and black pepper. Stir-fry for another 1 to 2 minutes, until the garlic is fragrant and everything is evenly coated.

Transfer the stir-fry to a serving plate and serve hot. Enjoy as is for a low-carb meal, or pair it with rice or noodles.

