Prep the Crab: Check crab meat for shells. Gently flake into bite-sized pieces and place in a mixing bowl, keeping chunks intact.Make the Crab Salad: In a small bowl, mix mayonnaise, Dijon mustard, lemon juice, salt, and black pepper. Fold the dressing gently into the crab meat. Add diced celery, green onions, and optional dill. Adjust seasoning to taste.Toast the Rolls: Butter the inside of the rolls or brioche buns. Toast lightly in a skillet until golden brown.Assemble the Crab Rolls: Place a lettuce leaf inside each roll. Spoon a generous amount of crab salad into the rolls. Add optional hot sauce or extra lemon juice if desired.Serve: Serve immediately while the rolls are warm. Garnish with fresh herbs and lemon wedges if desired.