I've found that the best mix so far, is to make a large bowlful of about thirty hot chillis, three capsicum, about a dozen garlic corms, blitz them and get them going for a few days to ferment in some brown sugar.
Then reduce about three pounds of blitzed tomatoes to a paste, and, after sieving the peppers, add that to another large frying pan with half a cup of white wine vinegar, and reduce the whole lot to ketchup consistency...
Makes about a litre eventually!