In a wide, shallow pan, bring enough water to just cover the salmon. For extra flavor, add: A generous pinch of salt, A sprig or two of fresh thyme,A slice of lemon or splash of white wine (optional)
A few black peppercorns
Bring the liquid to a gentle simmer — not a rolling boil — to preserve the delicate texture of the fish.
Season the salmon lightly with salt and black pepper.
Carefully lower the salmon into the simmering liquid and poach gently for 8–10 minutes, or until just opaque and flakes easily with a fork.
Remove salmon with a slotted spoon and let it rest briefly while you prepare the black butter sauce.