It is some gas produced by natural fermentation during strawberry curing. Before making strawberry jam, sugar will be added for pickling. During the curing process, sugar will melt and soften, release water and pectin, and then further ferment. When cooking, these pectin and bubbles produced during fermentation will become white foam floating on the surface, and it is necessary to skim off the white foam with a spoon to continue cooking, otherwise the appearance of the finished product will be affected.

It is some gas produced by natural fermentation during strawberry curing. Before making strawberry jam, sugar will be added for pickling. During the curing process, sugar will melt and soften, release water and pectin, and then further ferment. When cooking, these pectin and bubbles produced during fermentation will become white foam floating on the surface, and it is necessary to skim off the white foam with a spoon to continue cooking, otherwise the appearance of the finished product will be affected.