Omuraisu

• 100 g (3½ oz) boneless chicken thigh
• 1 tablespoon vegetable oil

Cut the chicken into 2 cm (¾ in) cubes. Heat the vegetable oil and butter in a frying pan on a medium heat, then add the chicken and onion. Sauté until they are cooked, then add the mushrooms and rice. If the rice grains have stuck together, sauté until they are separated and heated through. Add the ketchup, stirring to coat all the grains of rice. Season with salt and pepper if needed, then se