INGREDIENTS
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1-1/2 lbs. salmon fillet, skinned, cut into 1-inch cubes, and chilled
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1 small shallot, finely diced (about 2 Tbs.)
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1 Tbs. capers, rinsed and chopped
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1 tsp. Dijon mustard
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Kosher salt and freshly ground black pepper
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1/2 cup mayonnaise
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1/3 cup dill pickle relish
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2 Tbs. chopped fresh dill
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2 Tbs. fresh lemon juice, more to taste
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2 Tbs. olive oil
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1 cup lightly packed baby spinach (about 1 oz.)
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1 small red onion, cut into thin rings
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1 large tomato, cut into 8 thin slices
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4 hamburger buns, split and toasted