1. The first step is to clean each bottle with clean water, as shown in the figure below.
2. Then take out the drained water and turn the bottle upside down, as shown in the figure below.
3. Then wash the prepared lemon, cut it in half and juice it for later use, as shown in the figure below.
4. Then peel the prepared bananas, as shown in the figure below.
5. Dice the peeled banana with a kitchen knife and set aside for later use, as shown in the figure below.
6. Put bananas, rock sugar and lemon juice into the pot together, add water and cook over low heat, as shown in the figure below.
7. Remove the astringent juice after boiling, as shown in the figure below.
8. Continue to cook until the jam thickens, and turn off the heat, as shown below.
9. Put the banana sauce into the washed bottle, flip the lid and put it in the refrigerator for 3 days, as shown in the figure below.
10, you can take it out and eat it after refrigeration, so that the banana sauce is ready.