Preheat the oven to 180. Remove steaks from the fridge and allow to get to room temperature, season each steak and add a little oil and set aside
Blitz together herbs, garlic onion and chilli with the oil and vinegar and season with salt and pepper
Add the tomatoes to a baking tray season and add a little oil, put in the oven to roast for about 5/7 minutes
Once you're ready to cook the steaks, heat a heavy bottomed frying pan and once hot, add the steaks. Cook for 2 minutes each side for medium rare, 2 1/2 minutes for medium and 4-5 minutes for well done. Serve with the Chimichurri sauce over the top with the tomatoes on the side.