Peel and dice the russet potato into small chunks, then place in a pot of salted water and boil until fork-tender, about 12-15 minutes.
While potatoes boil, place the broccoli florets in a steamer basket over simmering water and steam for 5-6 minutes until bright green and crisp-tender.
Pat the salmon fillet completely dry with a paper towel and season the skin side with a pinch of sea salt.
Heat 1 teaspoon of ghee in a non-stick skillet over medium-high heat and place the salmon skin-side down, pressing gently for 30 seconds to ensure even contact.
Sear the salmon for 4-5 minutes until the skin is golden and crispy, then flip and cook for an additional 2 minutes for medium doneness.
Drain the cooked potatoes and mash them thoroughly, stirring in the remaining half teaspoon of ghee, fresh chives, and a splash of potato cooking water if needed for creaminess.
Plate the herb potato mash, top with the pan-seared salmon, and serve alongside the steamed broccoli with a fresh squeeze of lemon juice over the fish.