Place all the vegetables in a large saucepan with some olive oil and the ginger, garlic, coriander, ground cloves, chilli and chopped basil stalks. Season with black pepper and salt.
Cook gently over a low heat for 15 minutes, or until softened. Add all the tomatoes and 350ml of cold water. Bring to the boil and simmer gently until the sauce reduces by half.
Add the basil leaves then whiz the sauce with a hand blender and push it through a sieve twice to make it smooth and shiny. Put the sauce in a clean pan and add the vinegar and sugar.
Bring to the boil and simmer until it reduces and thickens like the texture of tomato ketchup. Taste to see if it needs more salt and pepper.
Transfer to sterilised bottles or jars, then seal tightly and store in a cool dark place.
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