New England Lobster Rolls with Lemon Chive Mayonnaise

INGREDIENTS

• 1 tablespoon water (optional)
• 1 room temperature egg yolk
• 2 teaspoons chopped chives
• 2 cups cooked, diced lobster meat
• 1 1/2 teaspoon fresh lemon juice
• 2 ounces extra virgin olive oil
• 6 ounces canola or other neutral-flavored oil
• 1/8 teaspoon kosher salt
• 1/4 cup homemade lemon chive mayonnaise (or other good quality mayonnaise)
• Kosher salt and black pepper
• 3 tablespoons finely chopped celery
• 3 leaves Boston lettuce, sliced
• 4 top split hot dog buns
• 1 teaspoon dijon mustard
• 3 tablespoons unsalted butter, melted