When putting ketchup, use a glass container sealed with a lid and with high heat resistance, rinse it with boiling water before use and keep it dry. When taking jam from the bottle, use a clean and waterless spoon and take as much as you want. After taking it out, close the bottle cap tightly. Homemade ketchup can be stored in the refrigerator.

Real tomato sauce has no obvious salty taste, is not sticky, is dark and not bright enough, and is generally used as a cooking material. In a fast food restaurant, it tastes sweet and sour, and it is ketchup dipped in French fries. There are many ingredients in it, besides tomatoes, there are generally sugar, salt, thickener, umami and so on. When choosing, you should choose products with only tomatoes on the ingredient list.

Extended data:

Nutritional value of tomato sauce;

1, cancer inhibition: Lycopene can prevent some types of cancer, inhibit breast cancer, lung cancer and endometrial cancer, and also fight lung cancer and colon cancer.

2. Anti-aging: Lycopene in tomatoes has diuretic and antibacterial effects. It is an excellent antioxidant, which can scavenge free radicals in human body, and its anticancer effect is twice that of β-carotene.

3, promote appetite: tomato sauce tastes sweet and sour, which can increase appetite. Lycopene is more easily absorbed by the human body when it contains fat.

People's Daily Online-The shelf life of food is "food life", revealing the "life" of six common foods.

People's Network-Ketchup is actually very nutritious, teaching you how to make healthy ketchup.