He never warms the jars, so why doesn’t my son’s marmalade go mouldy ?

Our preserving pundits dive into the bittersweet dilemmas surrounding baking paper circles, wax seals and the judicious application of heat When my son makes marmalade, he never warms the jars or uses circles of baking paper and cellophane – he just puts the lids on. It never goes mouldy, so am (…)