Lobster Rolls with Lemon Vinaigrette and Garlic Butter Recipe

Ingredients

• 4 (1 1/4-to 1 1/2-pounds) live lobsters
• 3 tablespoons fresh lemon juice
• 1/3 cup extra-virgin olive oil
• 1/3 cup thinly sliced scallions
• 1/4 cup finely chopped peeled celery
• 1/4 cup celery leaves
• 1/4 cup chopped flat-leaf parsley
• 1/2 stick unsalted butter
• 3 garlic cloves, smashed
• 6 hot dog buns, preferably top-split
• Accompaniment: lemon wedges