Place the salmon in a food processor and process until coarsely chopped. Transfer to a deep bowl.
In the deep bowl, mix the salmon with the shallots, capers, mustard, and season with salt and pepper. Form 4 burgers with your hands and place them on a plate, refrigerating them until you are ready to cook.
Meanwhile, make the tartar sauce by mixing mayonnaise, pickle, dill, lemon juice, and salt and pepper in a deep bowl.
Heat a skillet over medium heat and grease with 1 tablespoon of olive oil. Cook the salmon burger until lightly browned (3 minutes on each side). Repeat with all the burgers.
Assemble each burger by placing spinach, tomato, and red onion on the buns. Then place a salmon burger and finally 2 tablespoons of tartar sauce. Cover with the other half of the bun.
Nutritional Information
* * Information per 100g serving, percentage of daily values based on a 2,000 calorie diet.
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