For the patties: Mix together the egg, mayonnaise, mustard, seafood seasoning, lemon juice and hot sauce in a bowl until thoroughly combined. Fold in the salmon, scallions and panko until the mixture is combined again. Form into 4 patties, then set aside.
Place a large skillet over a medium-high heat and add the oil. When the oil is hot, add the patties and cook until golden and crisp, 4 to 5 minutes per side. Drain on a paper towel.
For the caper mayo: Mix together the mayonnaise, lemon juice, capers, hot sauce, salt and pepper.
To assemble: Spread some of the caper mayo on the bottom of a toasted bun. Top with a salmon patty, lettuce, tomato and pickle. Spread the other half of the bun with a bit more of the mayo and place on top. Repeat with the remaining ingredients. Serve.
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