150g beef sirloin, sliced
1 tablespoon vegetable oil
1 clove garlic, minced
1/2 onion, sliced
1/2 red bell pepper, sliced
1/2 green bell pepper, sliced
1 carrot, julienned
2 tablespoons soy sauce
1 tablespoon oyster sauce
1 teaspoon cornstarch
1/4 cup beef broth
Salt and pepper to taste