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It is used to get them very soft, soft to the point where they will accept an imprint from a mould. It is quicker than boiling in water (which doesn't get as hot as oil) and sometimes just a 5 - 15...

To just flatten them, place them into boiling water until they go soft and rubbery. You don't even need boiling water - steam can do it, so can hot air or another dry heat source - but then you risk...