Use the largest bowl - make the dressing in in and then add ingredients.
Whisk lemon juice, mustard (this may be in the lunch cooler), salt, and pepper in a large bowl- while whisking, slowly drizzle in oil until emulsified.
Break up lettuce leaves.
Cut avocados into cubes.
Add romaine, avocado, parmesan, pine nuts, salt, and pepper,.
Toss to combine.