Well-Dressed Salmon

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1/2 seedless cucumber

2 small plum tomatoes

1 shallot or 1/4 red onion, finely chopped, divided

2 tablespoons Dijon mustard

2 tablespoons sugar

1/4 cup white wine vinegar

1/2 cup extra-virgin olive oil, plus a drizzle

1/4 cup finely chopped fresh dill

Salt and freshly ground black pepper

4 (6-ounce) skinless salmon fillets

Seafood seasoning (recommended: Old Bay)