Slice beef tenderloin, marinate it with salt, black pepper, oyster sauce or cornmeal water in advance, then stir-fry it in oil pan to keep its tenderness.
Finally, mix with other materials and stir fry. Choose onion, green pepper and Pleurotus eryngii to match beef, and it is very good to match dishes with black pepper flavor, especially Pleurotus eryngii, which can absorb the delicious beef and rich black pepper juice.