But what recipe to use? A quick rummage through my cookbooks turned up nothing. Hmm... time to get inventing!
1.7kg tomatoes, roughly chopped
4 large onions
1.5 cups vinegar
1 cup sugar
2 cups water
Chop the onions finely. Cook with a splash of olive oil in a deep heavy bottomed saucepan until softened and transparent. Add the other ingredients and bring to the boil. Drop to a simmer, and simmer for an hour, topping up with water if required. Push through a seive and pour into jars.
Someone asked for my judgement on how it worked out. I would describe it as a complete success (I don't post up my failures