Potato and Caramelized Onion Blintzes

While cheese scores as the favorite Shavuot blintz filling, savory potato perennially places a close runner-up. A combination of alliums adds complexity to this version: creamy mashed potatoes are mixed with a tangle of sweetly caramelized onions given gentle bite with grated raw ones, then rolled in pretty chive-flecked blintz leaves. For other delicious potato blintz fillings, see Potato-Onion Kreplach, Pot Sticker-Style and