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Rum and raisin has been a freezer staple for decades and has barely changed in that time, which is unusual in a category that reinvents itself constantly. The raisins are doing something specific. Dried fruit stays chewy at freezer temperature where fresh fruit turns to ice, so raisins are one of the few inclusions that keep a soft texture in a frozen base. Soaking them first is the traditional step, and it stops them drawing moisture out of the ice cream around them. The rum flavour sits in the base rather than in the fruit. It's the sweet, faintly spiced note that separates this from a plain fruit ice cream, and the reason the flavour has always read as an adult one.