Ten pounds of heirloom tomatoes. That is what goes into this relish, and the result is four jars of something so concentrated and spicy that a single spoonful changes whatever you put it on. The tomatoes cook in peanut oil with ground chili flakes, fennel seeds, coriander seeds, cumin, turmeric, red onions, Thai chili peppers, apple cider vinegar, and brown sugar until the liquid evaporates and the oil separates into a thick, dark paste.