Combine the crabmeat, mayonnaise, pepper, and lemon juice in a large bowl. Form into 3-ounce cakes. Place the panko breadcrumbs in a pie plate and coat the cakes evenly. When the oil reaches 375ºF, pan-fry the cakes until golden brown, 3 to 4 minutes per side. Drain the finished cakes on a wire rack set over a half-sheet pan lined with paper towels.