1, add lemon juice sealed refrigerated; homemade ketchup want to extend the shelf life, the most effective practice is to do a good job of ketchup drops of lemon juice, and then loaded into a clean container without impurities and raw water, into the refrigerator and refrigerated, generally speaking, 10 to 15 days will not deteriorate, the flavor of the best.

2, add white wine sealed refrigerated; tomato sauce system done, in the altar before the appropriate amount of a few drops of white wine, and then seal the altar before the cover 1 to 2 layers of plastic wrap, and then put into the refrigerator to refrigerate, this can be very good to prevent oxidation of the tomato sauce or deterioration, the better the sealing, the longer the preservation time.