Put chopped tomato and onion in a large bowl and cover with the salt (I used murray river salt flakes for this). Leave overnight or for 6-8 hours at room temperature
Rinse the tomatoes and onion well and then place the tomato mixture into a saucepan with 1 cup of the malt vinegar. Bring to the boil and then reduce to low and simmer for 30 minutes
Mix flour, curry powder and seeded mustard with remaining cup of vinegar and stir into mixture. Cook for 3-4 minutes until thickened. Pour the relish into sterilised jars. Store in your pantry or gift them to loved ones! Once open store in the refridgerator.