1 pound cooked fresh Maine lobster meat, chilled
2 tablespoons mayonnaise, preferably extra heavy (see Cook's Note)
2 tablespoons butter, melted, plus more if needed
4 New England-style hot dog rolls (see Cook's Note)
Minced fresh chives, for topping
1/2 lemon, cut into 4 wedges
Extra-heavy mayonnaise, which has extra yolks added, is thicker and richer than regular mayonnaise. New England-style hot dog rolls are split-top rolls with flat sides. If you are unable to find them in your area, try using another roll and slice the sides flat for a greater grilling surface.