Preheat oven to 350 degrees F. Line a baking sheet with parchment paper
Combine honey, lemon juice, Dijon mustard, lemon zest, salt, and pepper in a small bowl. Spread marinade evenly on the salmon. Let sit for 10 minutes.
Sprinkle ground pistachios on top, gently pressing down to create a crust. Bake salmon for 15 minutes or until the fish flakes easily. Remove from the oven.
Meanwhile, make the onion chive butter. Melt butter in a small saucepan over medium heat. Add garlic and onion powder and cook for 1 minute, stirring constantly. Remove from heat and add chopped chives, stirring to combine. Drizzle on the salmon and serve immediately.
Notes
You can marinate the salmon in the honey mustard marinade for up to 30 minutes.