盐和糖的保质期,远比你想象的长
Many of the foods that last for a long time are high in sugar and salt. In simple terms, they draw water out, so if bacteria try to grow on it, they will simply shrivel up. This is why we use salt to make ham, sugar to make jam, and both to make gravlax. As foods in their own right, if salt and sugar are stored away from moisture in airtight containers, they will last indefinitely. But additives, such as iodine added to salt, can reduce its shelf life to about five years. |