Delicious Beef Stir Fry

Name: Delicious Beef Stir Fry
Ingredients: 350 grams scotch fillet steak; 1 tablespoon shaoxing wine (substitute with red wine or sherry); 1 tablespoon light soy sauce; 1?2 teaspoon sugar; 1?4 teaspoon sesame oil; 1 tablespoon light olive oil, plus another 1?2 tablespoon; 1 onion, chopped finely; 1 clove garlic, chopped finely; 150 grams sugar snap peas or 1 bunch broccolini or asparagus, washed, trimmed and cut into small pieces 1?2 red capsicum; 1?2 yellow capsicum; A few fresh basil leaves; Steamed rice, to serve