This ensures the rounds are very thin and even. Set aside to cool for about 10 minutes before serving. Potato Leek Knish Recipe All pareve foods are suitable to be eaten with both meat and dairy foods, but meat and dairy foods are not to be eaten together. Potato knish recipe parve . Bake until lightly golden brown, about 20 minutes. The goal is to have all the potato slices evenly sized so they cook evenly. Add the potatoes to a pot and cover with salted water. Preheat oven to 375 degrees. Chop your onion and add it to a frying pan with 1 tablespoon of butter on low heat. Saute onion in veg oil until lightly golden brown. Add margarine, onions, salt and pepper. Using a potato masher, mash the potatoes until no lumps remain. Preheat the oven to 400f / 200c. If you have to cut with a knife, cut as thin as you carefully can. In a bowl, combine the potatoes, matzo meal, potato starch, onion, egg whites, pepper, and salt; Divide the broccoli evenly onto each ...