1. Slice the beef into thin slices.

2. Peel and devein the shrimp.

3. Heat some oil in a pan and fry the beef until browned. Set aside.

4. In the same pan, fry the shrimp until pink. Set aside.

5. In a separate pan, melt some butter.

6. Add the chopped garlic and sauté until fragrant.

7. Add the flour and stir well to make a roux.

8. Slowly add the milk while stirring constantly until the sauce thickens.

9. Add the fried beef and shrimp to the sauce and mix well.

10. Season with salt and pepper, and serve.