Purée tomatoes (with purée from can) in a blender until smooth.
Cook onion in oil in a 4-quart heavy saucepan over moderate heat, stirring, until softened, about 8 minutes. Add puréed tomatoes, tomato paste, brown sugar, vinegar, and salt and simmer, uncovered, stirring occasionally, until very thick, about 1 hour (stir more frequently toward end of cooking to prevent scorching).
Purée ketchup in 2 batches in blender until smooth (use caution when blending hot liquids). Chill, covered, at least 2 hours (for flavors to develop).
Cooks' note: Ketchup can be chilled up to 3 weeks.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	450.31 Kcal (1885 kJ)
Calories from fat	126 Kcal
		% Daily Value*
Total Fat	14g	22%
Sodium	615.88mg	26%
Potassium	365.41mg	8%
Total Carbs	80.57g	27%
Sugars	75.36g	301%
Dietary Fiber	1.7g	7%
Protein	1.15g	2%
Vitamin C	7.2mg	12%
Iron	1mg	5%
Calcium	84.1mg	8%

Amount Per 100 g
Calories	199.14 Kcal (834 kJ)
Calories from fat	55.72 Kcal
		% Daily Value*
Total Fat	6.19g	22%
Sodium	272.36mg	26%
Potassium	161.6mg	8%
Total Carbs	35.63g	27%
Sugars	33.33g	301%
Dietary Fiber	0.75g	7%
Protein	0.51g	2%
Vitamin C	3.2mg	12%
Iron	0.4mg	5%
Calcium	37.2mg	8%

* 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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