Ingredients: 350g of blueberry and 50g of yellow rock sugar.
1. Prepare some sealed glass bottles with jam, scald them with boiling water and dry them.
2. Wash and dry the blueberries, put them in an oil-free and water-free snow pot, and then prepare finely chopped yellow rock sugar.
3. Put a pot with blueberries, heat it on low heat, add half of the rock sugar, and keep turning it with a scraper.
4. After the blueberry juice comes out, pour in the other half of the rock sugar, turn on medium-high heat and keep stirring to prevent the pan from sticking.
When the juice becomes sticky, you can turn off the fire and cook.