Preheat oven to 375 degrees and lightly coat a 9x13” baking dish with 1 tablespoon of the ghee.
In a small bowl, mix together Dijon mustard and pecans. Season salmon with salt and pepper to taste, thyme, and then top with mustard and nut mixture. Place the salmon in the baking dish.
In a separate medium bowl, add ghee, broccolini, onions, garlic, and toss to combine. Surround fish with veggie mixture and bake 15-20 minutes, until fish is opaque and cooked through.