Preheat oven to 200C/Gas6. In a bowl, mix the steak with salt, pepper and crushed garlic. Cover and set aside. Put the sweet potato cubes on a baking tray, season with salt and mix with 3 tbsp of the olive oil. Roast for 20-25 mins. Meanwhile, steam the Tenderstem for 3-4 mins. Remove from the pan immediately and put in a bowl with iced water.
Heat 1 tbsp oil in a wok or large frying pan over high heat. Cook the beef quickly, stirring until it browns. Add chilli and onion, stir and add red wine vinegar and stock.
Let it simmer for 30 secs, stirring frequently.
Add the cherry tomatoes, Tenderstem and spring onion, and season with salt and pepper. Stir well. Turn the heat off and sprinkle with roasted sweet potato cubes and coriander leaves. Serve, covered in its juices with rice.
Recipe by appetite magazine at https://www.appetitemag.co.uk/beef-lomo-saltado/