It's true that traditional perry is made from "perry pears," just like traditional apple cider is made from cider apples. Fermenting sweet pears will give you a sort of pear cider, much like Ed Wort's apfelwein (pearfelwein?); not a true perry, but not bad on the palate either. In theory, you could add acid(s) & tannin(s) to your pear juice to replicate true perry, but the catch is: you have to know what true perry tastes like. You might have better luck trying to locate & purchase perry pears/juice. You may find this link useful. The Real Cider and Perry Page Regards, GF.