Grilled Salmon Filet with Honey Mustard Sauce

Sauce
1/4 cup Dijon mustard
2 tablespoons whole-grain mustard
3 tablespoons honey
2 tablespoons prepared horseradish, drained
2 tablespoons finely chopped fresh mint leaves
Kosher salt and freshly ground black pepper

Fish
2 pound fillet salmon, skin on
2 tablespoons canola oil

Salad
1 bunch salad greens, coarsely chopped
1 small red onion, halved and thinly sliced
2 tablespoons aged sherry vinegar (or other vinegar you might have on hand)
2 tablespoons extra-virgin olive oil

Sauce
Whisk together the mustards, honey, horseradish, mint, 1/4 teaspoon of salt, and 1/4 teaspoon of pepper in a small bowl. Let sit for at least 15 minutes before using. Can be made 1 day in advance and refrigerated but do not add the mint until just before using. Bring to room temperature before using.

Salmon
Heat the grill to high. Brush the salmon with the oil and season with salt and pepper. Place the salmon on the grill, skin side down, and grill until golden brown and slightly charred, about 3 minutes.

Salad
While the salmon is cooking, place the watercress and onion in a medium bowl, add the vinegar and oil and salt and pepper and toss to combine. Transfer the salad to a platter, top with the salmon fillet and drizzle each fillet with the mustard sauce.

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