INGREDIENTS
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1 1/4 pounds center-cut salmon fillet, skin and pin bones removed
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2 tablespoons dijon mustard
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1 tablespoon mayonnaise
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1 tablespoon lemon juice
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1/2 teaspoon grated lemon zest
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Pinch of cayenne pepper
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2 scallions, chopped
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1 cup plus 2 tablespoons panko (Japanese breadcrumbs)
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Kosher salt and freshly ground black pepper
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2 tablespoons extra-virgin olive oil, plus more for brushing 4 brioche buns, split
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Tartar sauce and arugula, for topping