Preheat the grill to medium-high heat.
Pat the salmon fillets dry with paper towels. Season lightly with salt and pepper.
In a small bowl, stir together the softened Challenge Unsalted Butter, miso paste, honey, lime or lemon juice, and garlic, if using, until smooth.
Brush the grill grates or salmon lightly with olive oil to help prevent sticking.
Place the salmon fillets on the grill, skin-side down if using skin-on salmon. Grill for 4 to 6 minutes.
Spoon or brush some of the miso butter over the salmon. Continue grilling for another 2 to 4 minutes, or until the salmon is cooked through and flakes easily with a fork.
Transfer the salmon to a platter. Spoon a little extra miso butter over the warm fillets.
Garnish with sliced scallions and sesame seeds, if desired. Serve with lime or lemon wedges.
White miso is mild and slightly sweet, which works well with salmon. Because miso is salty, season the salmon lightly at the beginning and taste the butter before adding extra salt.
For a sweeter glaze, add another teaspoon or two of honey. For more brightness, finish with extra lime or lemon juice before serving.
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