Prep & Butterfly: Using sharp kitchen shears, cut down the center of each shell (shell-side down) and gently loosen the meat. Lift it to rest atop the shell.
Clarify Butter (Optional): Melt butter over low heat, skim off any milk solids for a clearer poaching liquid.
Infuse Butter: In a heavy saucepan, combine butter, garlic, shallot, thyme, parsley, lemon zest, and (if using) wine. Warm to 140°F (60°C) and steep 10 minutes. Strain out solids if desired; return infused butter to pan.
Heat Poaching Butter: Bring butter to 160–165°F (71–74°C) and hold—do not exceed 180°F (82°C).
Poach Lobster Tails: Submerge lobster tails, meat-side down. Poach for 8–12 minutes (smaller tails ~8–9 min, larger ~10–12 min), until internal temp reaches 140–145°F (60–63°C).
Rest & Finish: Transfer tails to a warm platter; tent with foil and rest 3–4 minutes. Spoon a bit of poaching butter over each tail, then season with sea salt, pepper, chopped parsley, and a squeeze of lemon juice.