Ingredients

  • 1 large onion, peeled and chopped
  • 1 stalk celery, roughly chopped
  • 1 2-inch piece fresh ginger, peeled and chopped
  • 3 cloves garlic
  • 1 chili pepper, deseeded and finely chopped
  • 1 roasted red pepper
  • olive oil
  • 2 pounds fresh tomatoes, chopped
  • 3/4 cup red wine vinegar
  • Fine sea salt and freshly ground black pepper
  • 1/3 cup brown sugar, more or less to taste

Method

  • Place all of the vegetables but not the tomatoes and the ginger, garlic, and chili in a saucepan with a good pour of olive oil, and cook over low heat for 15 minutes.
  • Season with salt and pepper.
  • Add all of the tomatoes and a cup of water.
  • Bring to a boil and simmer until the sauce is reduced by about half.
  • Remove from heat and puree the sauce in a blender or food processor.
  • Or keep in the pot and use an immersion blender.
  • You haven't gone through the annoying bits of peeling and seeding the tomatoes, so now you'll have to double-strain the sauce through a sieve to get out any seeds and skins.
  • Place the strained sauce into a pan and add the sugar and vinegar.
  • Stir well and then simmer until the the sauce takes on the thickness of ketchup.
  • What you have now is ketchup.