stir-fried beef and vegetables

I ate stir-fried beef and vegetables in oyster sauce.
Ingredients (for 4 people)
Beef (cut off)
250g
(1 teaspoon each of sake and soy sauce, 2 teaspoons of potato starch)
Green asparagus
150g
onion
1 piece (150g)
green pepper
3 pieces (100g)
Midi tomato
4 pieces (150g)
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