Jarred pitted sour cherries ($6.99 for a 24-ounce jar of ZerGut brand) can be purchased from Kalustyan's (800/352-3451; www.kalustyans.com).
Sour cherry juice ($5.99 for a 35-ounce bottle; ask for sour cherry nectar) can be purchased from Kalustyan's (800/352-3451; www.kalustyans.com).
Prickly pear fruits ($16.75 for a box of ten; ask for cactus pears) are available from Melissa's/World Variety Produce (800/588-1051; www.melissas.com).
The Benriner Mandoline ($31.60; ask for the 3.6-inch-wide mandoline) is available at Bridge Kitchenware (212/688-4220; www.bridgekitchenware.com).
