1. Shred potatoes using a food processor or hand grater. Finely dice onions. Press potatoes and onions lightly in a dish towel to remove excess liquid.
2. Whisk eggs, milk and melted butter together. Add flour and sprinkle salt and black pepper to taste and mix well.
3. Fold potatoes and onions into batter. Just add enough potatoes so the potatoes are covered in batter.
4. Heat several tablespoons of oil in a heavy skillet. Scoop mixture, using 1/2 cup for each latke, into heated oil. Press to form 6-inch diameter pancakes. Brown each side.