Shred your potatoes and immediately put them into a bowl of cold water. Let soak for a few minutes.
2. Place the potatoes on a (clean) dish towel, wrap them up and squeeze out any excess water.
3. Heat a large cast iron skillet (or griddle) over high heat. Add a few tablespoons of butter. Once it’s melted, add the potatoes in a thin layer and turn the heat down to medium-high.
4. Season with salt and pepper.
5. Cook until very crispy and brown on the bottom, then flip and cook on the other side