Season the shrimp with the rub. Pour the water into a large saucepan and add the juice of the lemon and the lemon shells, bay leaves, 1 teaspoon salt, and the crab and shrimp boil. Bring to a boil over high heat for 5 minutes. Add the shrimp and remove from the heat. Let sit for 2 minutes. With a slotted spoon, remove the shrimp. Let cool slightly.
Coarsely chop the shrimp and mix together with the onions, parsley, celery, and green onions. Mix 1/4 teaspoon salt, the mustard, mayonnaise, and white pepper. Add to the shrimp mixture and mix well.
To prepare the artichokes, lay each artichoke on its side on a cutting board. Evenly trim the base and cut off about 1 inch of the top. Sit the artichoke on its base, spread apart the outer leaves, and carefully remove and discard the center section, including the choke.
Divide the shrimp salad into equal portions and spoon into the center of the artichokes.
Toss the greens with a pinch of salt, the olive oil, and black pepper. Divide into equal portions and arrange on plates,
Place the artichokes on top of the greens and refrigerate for at least 15 minutes or up to 1 hour.
Yield: 2 to 4 servings