3
Meanwhile, place the tomatoes, garlic and onion on a baking tray and cook in the oven for 30 minutes or until blackened. Peel the garlic and place in a blender with the tomatoes and onion, then add the soaked chillies and the water. Blitz until chunky, then add the cumin and salt. Taste and adjust the seasoning as necessary – it should be smoky and a little spicy. Decrease the temperature of the oven to 150°C/gas mark 2