Recipe courtesy Tyler Florence
Combine vinegar, sugar, dry mustard, ginger, salt and turmeric in a large pot and bring to a boil. Simmer for 15 minutes to extract the flavors of the spices and once it is boiling and steaming add tomatoes and onion. Gently toss to coat everything and simmer for 5 minutes. Shut off heat and allow to come down to room temperature.
Edited: July 31st, 2009