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How to Sterilize Bottles and Jars for Preserves | For hundreds of years people have been preserving fruit and vegetables by "jamming" them. Preserves will keep for a long time if properly prepared and bottled, but the bottles and jars used must be sterilized.
Yummy Supper: BOLINAS BLACKBERRY JAM Easy sterilizing technique: place clean jars on a baking sheet in a 250 degree oven while your jam is cooking (for at least 10 minutes). Paul also puts a glass Pyrex pouring cup in the oven along with the jars to sterilize the all the glass. He then washes the lids and seals in hot soapy water.