200g beef sirloin, thinly sliced
1 tablespoon vegetable oil
1 garlic clove, minced
1/2 onion, sliced
1/2 red bell pepper, sliced
1/2 green bell pepper, sliced
1/2 carrot, julienned
2 tablespoons soy sauce
1 tablespoon oyster sauce
1 teaspoon cornstarch
1/2 cup beef broth
Salt and pepper to taste