How to make tomato sauce is as follows:

1. Peel the tomatoes and dice them.

2. Pour the diced tomatoes into the pot, add rock sugar and boil together.

3. When it becomes thick, add a few drops of white vinegar and continue to simmer for a few minutes.

4. Turn off the heat and put the prepared tomato sauce into a bowl.

The preservation method is as follows:

1. Prepare a clean glass bottle before making homemade tomato sauce. It must be a glass bottle that can be completely sealed. Heat the bottle and bottle cap. After scalding and disinfecting, turn the bottle upside down to completely dry out the water before use. The treated glass bottle must be free of oil and raw water.

2. After the tomato sauce is cooked, put it into a glass bottle while it is hot, leaving a gap of about 1cm on top, then drop in a small amount of high-strength white wine or lemon juice, and tighten the bottle cap immediately. If you are worried that the sealing effect of the bottle cap is not very good, you can first cover it with 1 to 2 layers of plastic wrap, and then tighten the bottle cap.

3. After the tomato sauce in the glass bottle has completely cooled, you can move it to the refrigerator to refrigerate or store it at room temperature.