01 - Grate potatoes and onion using a box grater or food processor with large holes.
02 - Place grated mixture in a clean kitchen towel and wring out as much liquid as possible.
03 - Transfer mixture to a large bowl; add eggs, flour, salt, and pepper. Mix thoroughly until well incorporated.
04 - Warm vegetable oil in a large skillet over medium-high heat until shimmering.
05 - Scoop 2 tablespoons of mixture per latke, gently flatten in hands. Fry in batches without crowding, 3–4 minutes per side until golden and crisp.
06 - Remove latkes and drain on paper towels or wire rack set over a baking sheet.
07 - Continue frying remaining mixture; serve latkes hot with optional sour cream or applesauce.