Beef vegetable stir fry

Beef and Vegetables 400g steak, (flank steak, Entrecote, sirloin steak etc) 4 tablespoons olive oil Mixed bell peppers 1 onion 1 large carrot 1/2 cup spring onion for garnish Salt and pepper to taste Cilantro for garnish (optional) Sesame seeds for garnish (optional) 2 chiles (optional) Sauce 3 tablespoons soy sauce 1 teaspoon garlic 1 teaspoon ginger 1 tablespoon lime 1 tablespoon sugar