1. After the pot is hot, first pour 500 grams of white vinegar and 300 grams of sugar. After it is dissolved, add15g of salt and 35g of tomato juice, stir evenly, boil and cool, and get the sweet and sour juice with unique flavor.

2. Different brands of ketchup have different sweetness and acidity. After mixing the sauce, you can taste it, and increase the amount of tomato sauce or sugar according to your own taste until you bring out your ideal sweet and sour juice.