01 - Grate half of the potatoes using a box grater. Place the grated potatoes in a clean tea towel and squeeze out as much moisture as possible.
02 - Boil the remaining potatoes in salted water until tender, about 10-12 minutes. Drain well and mash until smooth.
03 - In a large bowl, combine the grated raw potatoes, mashed potatoes, flour, egg, milk, melted butter, scallions, salt, and pepper. Mix until a thick batter forms.
04 - Heat a large nonstick skillet or griddle over medium heat and brush with a little butter.
05 - Drop heaping tablespoons of batter into the pan, flattening gently to form pancakes about ½ inch thick. Cook for 3-4 minutes per side, or until golden brown and crisp.
06 - Transfer cooked pancakes to a plate lined with paper towels. Repeat with remaining batter, adding more butter as needed. Serve hot, garnished with extra scallions if desired.