牛肉洋葱怎么炒

```python
# Here is a simple recipe for stir-fried beef and onions:

# Ingredients:
- 200g beef, thinly sliced
- 1 onion, sliced
- 2 cloves of garlic, minced
- 1 tablespoon soy sauce
- 1 tablespoon oyster sauce
- 1 teaspoon sugar
- Salt and pepper to taste
- Cooking oil

# Instructions:
1. Heat some oil in a pan over medium-high heat.
2. Add the minced garlic and stir fry until fragrant.
3. Add the sliced beef and cook until browned.
4. Add the sliced onions and continue to stir fry until they are soft.
5. Season with soy sauce, oyster sauce, sugar, salt, and pepper.
6. Stir well to combine all the ingredients and cook for another 2-3 minutes.
7. Serve hot with steamed rice.

Enjoy your delicious stir-fried beef and onions!```