Preheat the broiler. Toss the onion slices with the olive oil and broil them until charred, about 8 minutes on each side.
Put the onions and all the remaining ingredients in a deep heavy nonreactive pot. Simmer uncovered over low heat for about 3 hours, stirring every 15 minutes to break up the tomatoes and to keep the ketchup from sticking to the bottom of the pot. The mixture will thicken.
Puree the ketchup in batches in a food processor or blender. If the puree seems too thin, return it to the pot and simmer until it is as thick as you like it. This ketchup keeps well refrigerated for up to 4 weeks.
Home Spice Mix:
Heat a skillet over medium heat until hot. Add the cumin seeds and toss occasionally until lightly toasted, about 1 minute. Transfer to a plate to cool, and repeat with the coriander seeds and then the mustard seeds. Be careful that the spices don't burn. You'll know that they're done when a toasty, nutty aroma rises out of the pan. When the seeds are cool, coarsely grind them together in a spice grinder or in a mortar with pestle. Yield: 3/4 cup

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	348.49 Kcal (1459 kJ)
Calories from fat	123.35 Kcal
		% Daily Value*
Total Fat	13.71g	21%
Sodium	870.28mg	36%
Potassium	879.23mg	19%
Total Carbs	54.19g	18%
Sugars	31.19g	125%
Dietary Fiber	9.57g	38%
Protein	6.42g	13%
Vitamin C	36.6mg	61%
Iron	10mg	56%
Calcium	261.8mg	26%

Amount Per 100 g
Calories	106.08 Kcal (444 kJ)
Calories from fat	37.55 Kcal
		% Daily Value*
Total Fat	4.17g	21%
Sodium	264.91mg	36%
Potassium	267.64mg	19%
Total Carbs	16.5g	18%
Sugars	9.49g	125%
Dietary Fiber	2.91g	38%
Protein	1.95g	13%
Vitamin C	11.1mg	61%
Iron	3.1mg	56%
Calcium	79.7mg	26%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

Tastes

salty
savory
bitter
sweet

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