I am planning to can a plum chutney and have ordered the Stagioni 10 1/2 oz jars. Having only used Ball jars, I am not sure I understand why their website says to remove from water and place upside down for 15 minutes:
For preparations that require cooking (e.g. jams, marmalades, sauces, etc..) it’s possible to create the vacuum without boiling the jars in water, proceeding as follows: preheat the jars with hot water, fill them with the hot preparation, seal with the cap and immediately turn upside down (taking care not to handle them with bare hands to prevent burns). Avoid placing them on cold surfaces (metal, marble, etc..) and keep them upside down for at least 15 minutes. Subsequently put them back with the capsule facing upwards and let them cool down in a cool place. It is not advisable to use the 0.15 l jar for the above described heat potting due to the reduced content within which employs a much shorter time for the cooling that may not be sufficient for the vacuum formation process.
Does anyone know?