Step 1

Combine 3 tablespoons panko, dill, capers, smoked salmon, mayonnaise, lemon juice, scallion, shallot, mustard, salt, pepper, and cayenne in bowl. Working in 3 batches, pulse salmon in food processor until coarsely chopped into 1/4-inch pieces, about 2 pulses, transferring each batch to bowl with panko mixture. Gently mix until uniformly combined.

Step 2

Place remaining 3/4 cup panko in pie plate. Using 1/3-cup measure, scoop level amount of salmon mixture and transfer to baking sheet; repeat to make 8 cakes. Carefully coat each cake in bread crumbs, gently patting into disk measuring 2 3/4 inches in diameter and 1 inch high. Return coated cakes to baking sheet.

Step 3

Heat oil in 12-inch skillet over medium-high heat until shimmering. Place salmon cakes in skillet and cook without moving until golden brown, about 2 minutes. Carefully flip cakes and cook until second side is golden brown, 2 to 3 minutes. Transfer cakes to paper towel–lined plate to drain 1 minute. Serve.