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Pressure cookers1) can be extremely useful in a campervan. They can:
Note that since the vessel is pressurized during cooking one cannot easily add ingredients or stir the food while cooking.
Pressure canning is one way to get shelf-stable foodstuffs that do not require refrigeration.
If you want to use the pressure vessel for low-acidity (pressure) canning, the National Center for Home Preservation (NCHFP) recommends using a canner that can hold at least 4 quart jars.3)
Canning jars can also do double duty as drinking cups, and the ones marked with measurements can act as measuring cups. Insulated coozies for mason jars can make them easier to handle.
folding ovens
solar ovens