Combine the lobster, celery, mayonnaise, 1 tablespoon of the lemon juice, 1 teaspoon salt, and 1/2 teaspoon pepper in a medium bowl and set aside.
Combine the avocados in another bowl with the remaining 1 1/2 tablespoons of lemon juice, 1 1/2 teaspoons salt, and 3/4 teaspoon pepper and coarsely mash together with a fork.
Place the bottom halves of the rolls on a board and spread with the avocado mixture. Arrange the lobster mixture on top. Replace the roll tops and serve at room temperature.
Copyright 2022, Go-To Dinners, Clarkson Potter/Publishers, All Rights Reserved