01 -
Put a quarter of the salmon and the mustard into a food processor and pulse till it's paste-like. Move that into a bowl. Then pulse the rest of the salmon but keep some chunkiness and mix it in.
02 -
Throw in green onions, parsley, coriander, sumac, paprika, pepper, and a good pinch of kosher salt. Stir it all well, cover it, and pop it into the fridge for half an hour.
03 -
Get a baking sheet ready with parchment paper. Have your bread crumbs on a plate. Split the salmon mix into four equal balls and press each into 1-inch thick patties. Dredge both sides in crumbs and set them on the sheet.
04 -
Warm the olive oil in a pan over medium-high heat till it’s hot and shimmering. Gently fry the patties till golden on both sides and cooked medium-rare, flipping once. That should take 2 to 4 minutes per side. Use a food thermometer to check they’re 115°F to 120°F inside. Turn heat down if crumbs start to burn.
05 -
Drain the patties on paper towels to soak up extra oil. Sprinkle a little salt on them and squeeze fresh lemon juice over the top.
06 -
Spread tzatziki over the toasted buns, then add the salmon patty. Stack on arugula, tomato slices, and red onion rings. Eat right away.