Spicy Sesame Beef Stir-fry

400g lean beef

2 onions

1 red bell pepper

1 green bell pepper 

2 carrots

125 ml beef stock 

2 tbsp dark soy sauce 

3 cloves garlic

2cm ginger 

1tsp chilli flakes 

2tbsp sesame

1tsp cornstarch

2 tbsp fresh cilantro

Salt, Pepper

Chop up beef and veggies. Brown the onions and add beef, stir-fry for 2-3 minutes then add veggies. Mix the remainig ingredients and add to the beef-veggie-mix. Cook until sauce thickens. Season to taste. Serve with brown rice or quinoa.