green tomato chutney

Blight struck and winter threatens so all those tomatoes not destined to get mown into the lawn were rescued, not many of these were red and so that autumnal ritual of chutney making began. The recipe is very simple and easily adaptable. I say this because I stole it from nigel slater and then just changed bit. My recipe was:

900g of tomatoes, about 50% green. Chopped up nice and small.
350g of white onion, chopped up small.
250g of sugar. The recipe called for light brown and i had dark so it was 200g of caster, 50g of muscavado.
90g raisins.
2tsp of black mustard seads. Again the recipe called for yellow and didn't get them.
1tsp of salt.
Splash of hot pepper sauce in tha absence of a fresh chilly.