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1
Cut three-quarters of the salmon into 1/4-inch pieces.
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2
Put in a large bowl.
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3
Cut the rest of the salmon into chunks; transfer the chunks to a food processor along with the mustard, mayonnaise, lemon juice, lemon zest and cayenne.
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4
Pulse to make a paste.
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5
Add the pureed salmon mixture to the bowl with the diced salmon.
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6
Add the scallions, 2 tablespoons panko, 1/2 teaspoon salt, and black pepper to taste.
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7
Gently mix until just combined.
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8
Line a baking sheet with parchment paper and brush with olive oil.
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9
Divide the salmon mixture into 4 mounds on the parchment paper.
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10
With damp hands, pat into 4-inch-wide, 3/4-inch-thick patties.
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11
Cover loosely with plastic wrap and refrigerate at least 30 minutes.
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12
Preheat the broiler.
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13
Spread the remaining 1 cup panko on a plate.
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14
Press both sides of the salmon patties in the panko.
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15
Heat the olive oil in a large nonstick or cast-iron skillet over medium-high heat.
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16
Add the patties (in batches if necessary) and cook until browned on the bottom, 3 to 4 minutes, adjusting the heat if necessary.
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17
Turn and cook until the other side is browned and the patties feel springy in the center, 3 to 4 more minutes.
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18
Transfer to a paper towel-lined plate to drain; season with salt.
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19
Meanwhile, arrange the buns, cut-side up, on a broiler pan and broil until toasted, 1 to 2 minutes.
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20
Serve the patties on the buns; top with tartar sauce and arugula.
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21
Photograph by Kana Okada