How can you save money and make delicious tomato relish in Uruguay?

With 'damaged' tomatoes costing only 25pesos a kilo at the local Sunday feira (on corner of Jamaica and Alberdi) I was inspired to make some tomato relish!

It is super easy, cheap, tastes great and seeing as you can't buy truly homemade relish in Uruguay it is an awesome treat.

My favourite recipe is from my trusty Edmonds Cookery Book (part of New Zealand Heritage since 1879!):

1.5kg tomatoes, blanched, skinned and quartered
4 onions, quartered
2 tablespoons salt
2 cups brown sugar
2 1/4 cups malt vinegar (or apple vinegar, which is what I use)
3 chillies
1 tablespoon dry mustard
1 tablespoon curry powder
2 tablespoons plain flour
1/4 cup malt vinegar (or apple vinegar, which is what I use)

Put tomatoes and onions into a non-metallic bowl.  Sprinkle with salt and leave for 12 hours.  Drain off liquid formed.  Put vegetables, sugar, first measure o vinegar and chillies into a pan. Boil gently for 1 1/2 hours, stirring frequently.  Mix mustard, curry, flour and second measure of vinegar to a smooth paste.  Stir into relish.  Boil for 5 minutes.  Pack into sterilised jars.  Makes about 4 x 350ml jars.