Sweet potato kugels

Ingredients

• 2 pounds sweet potatoes, washed and peeled
• 1 large onion, peeled
• 3 eggs
• ¼ cup butter, melted and cooled, or margarine
• 5 tablespoons all-purpose flour (or matzo meal for Passover)
• 1 teaspoon salt
• ¼ teaspoon black pepper
• ¼ cup scallions, minced, plus more for topping
• recipeIngredient ends