Grilled Salmon Fillet with Honey Mustard Sauce Ingredients 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 2 pound fillet salmon, skin on 2 tablespoons canola oil 1 bunch watercress, coarsely chopped 1 small red onion, halved and thinly sliced 2 tablespoons aged sherry vinegar 2 tablespoons extra-virgin olive oil Directions Whisk together the mustard, honey, horseradish, mint and 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. Heat the grill to high. Brush the salmon with the oil and season with salt and pepper. Place the salmon on the grill, ...