1. Preheat your waffle iron according to the manufacturer's instructions.

2. In a small bowl, mix together 120ml (1/2 cup) sour cream, 15g (1 tablespoon) finely chopped scallions, also known as green onions, and a pinch of salt and pepper. Taste and adjust the seasoning as needed.

3. Place a small dollop of butter in the waffle iron and top with a potato pancake. Spread a thin layer of butter on top of the pancake.

4. Cook the pancakes one at a time in a normal-sized iron. You may be able to cook multiple pancakes at once depending on the size of your waffle iron.

5. Close the waffle iron and cook for 3-5 minutes, or until the pancakes are golden brown and crispy, at a medium to high heat setting. Press down gently during cooking to ensure even cooking.

6. To keep a large batch of pancakes warm, place them in a low-temperature oven at 120°C (250°F).

7. Serve the crispy potato pancakes with a dollop of scallion cream on top.