3 knishes more Recipes

russet potatoes, butter, minced onion, fat-free chicken broth or 3 tbsp vegetable broth, salt, more to taste, ground black pepper, more to taste, seasoning (optional) or chives (optional) or red pepper flakes, to taste (optional), sheets phyllo dough

all-purpose flour, plus more for dusting, extra-virgin olive oil, plus more for brushing, kosher salt, cold seltzer, apple cider vinegar, russet potatoes, peeled and quartered, kosher salt, extra-virgin olive oil, spanish onions, diced, garlic , smashed, whole or coarse kasha (roasted buckwheat groats; available in the bulk aisle or near the dried beans), freshly ground pepper, spicy mustard , for serving