First, immerse the glass jars in a casserole dish and make sure that the jars do not touch the metal of the container. Then count from 10 minutes after boiling. Then lay out a clean tea towel and dry the glass jars turned upside down. Then pour the hot food into the glass jars while leaving a margin of 2 cm with the edges. Then close the jars tightly to place them in a pot. Make sure that there is at least an inch of water above the pots in the pot. When the contents are boiling, lower the heat so that the jars can sterilize for as long as it takes. The sterilization time varies depending on the capacity of the glass jars and their contents.