1. Bring a large pot of water to a boil. Prepare an ice-water bath. Generously salt boiling water and return to a boil. Plunge lobsters headfirst into boiling water and cook for 5 minutes; immediately transfer to ice-water bath to cool.

2. Meanwhile, preheat broiler. In a small bowl, mix together butter, parsley, chives, and 1/2 teaspoon salt; set aside.

3. With a large knife, cut cooled lobsters in half lengthwise. Place cut side up on a baking sheet and brush cut side with butter mixture.

4. Transfer to broiler and broil until lobsters are golden brown and cooked through, 6 to 8 minutes. Sprinkle with sea salt and serve immediately with lemon wedges.