2 tablespoons vegetable oil

1 pound beef sirloin, cut into 2-inch strips

1 ½ cups fresh broccoli florets

1 red bell pepper, cut into matchsticks

2 carrots, thinly sliced

1 green onion, chopped

1 teaspoon minced garlic

2 tablespoons soy sauce

2 tablespoons sesame seeds, toasted