
Pear juice is the unfermented juice pressed from ripe pears, with no added sugar.
Softness with almost no acidity is the point, so anything sharper changes the balance rather than the flavor. A carton tastes of cooked pear, and fresh pressing is worth the trouble here.
Pear nectar
Juice with water and often sugar added, a legally distinct category, sweeter and thinner in flavor, and substituting by volume puts sugar in the drink that the recipe did not plan for.
Perry
Fermented pear juice, an alcoholic drink in its own right, dry to off-dry and lightly sparkling, and it replaces the pear note and none of the sweetness.
Fresh juice browns within the hour and turns properly brown in a day or two, so press to order or add a squeeze of lemon to slow it. Refrigerated, use it inside two days.