To preserve or coat something in sugar; to make something into candy or preserve it as you would candy.
From candy (Arabic qandi) plus the verb-forming suffix -fy (from Latin facere, 'to make'). This technical term appears in historical cooking texts and chemistry, meaning to crystallize or sugar-coat.
Candifying fruit—making candied orange peel or candied ginger—is basically a medieval preservation technique that worked because sugar acts as a natural preservative by drawing out moisture that bacteria need to grow!
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