01 -
Place about one-quarter of the salmon and Dijon mustard into a food processor. Process until it forms a smooth paste. Transfer to a mixing bowl.
02 -
Add the remaining salmon to the food processor and pulse a few times until coarsely chopped, retaining some texture. Combine this with the paste in the mixing bowl.
03 -
Incorporate green onions, parsley, coriander, sumac, paprika, black pepper, and a generous pinch of kosher salt into the salmon mixture. Mix thoroughly to combine. Cover and refrigerate for 30 minutes.
04 -
Line a sheet pan with parchment paper and spread bread crumbs on a plate. Divide the chilled mixture into four equal portions and shape each into 1-inch thick patties. Coat each side of the patties by pressing into the bread crumbs. Place the breaded patties on the parchment-lined pan.
05 -
Heat olive oil over medium-high heat until shimmering. Carefully place patties into the oil and cook, flipping once, until medium-rare and golden brown on both sides, approximately 2 to 4 minutes total. Maintain temperature to avoid burning crumbs. Internal temperature should reach 115–120°F (46–49°C).
06 -
Transfer cooked patties to paper towels to remove excess oil. Lightly season with salt and finish with a squeeze of fresh lemon juice.
07 -
Spread tzatziki sauce on toasted buns. Layer with salmon patties, baby arugula, tomato slices, and red onion slices. Serve immediately.