1. Slice the beef into thin strips and marinate with some soy sauce.

2. Prepare the stir-fried rice by frying it in a pan with some butter and extra-virgin olive oil.

3. Finely chop the onion and garlic, and add them to the stir-fried rice. Mix well and continue frying.

4. In a separate pan, fry the marinated shrimp with some olive oil until cooked.

5. Add the fried beef to the shrimp and stir-fry briefly.

6. Serve the stir-fried rice with shrimp and beef, and season with soy sauce to taste.