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Why won't my homemade tomato ketchup thicken even though I cooked it for hours?

If tomato puree, paste or ketchup has not thickened after several hours of cooking, the most likely reason is that the product is being cooked in a covered pan. These products must be cooked uncovered to reduce the volume through evaporation. Use fairly high heat. Stir frequently to prevent sticking.       



Barbara Willenberg, Nutritional Sciences, University of Missouri-Columbia




Last update: Tuesday, May 05, 2009




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