Core lettuce, remove the two outermost leaves (discard) and run under water. Peel layers of lettuce apart one by one as water runs through leaves.
Cut off a large square piece of parchment paper. Fold one corner in to form a triangle shape.
Place a large lettuce leaf (or two) right along the folded edge.
Pack the lettuce leaves with your “sandwich” ingredients: swiss cheese, turkey, ham, tomato, avocado, and mustard.
Fold the top edge of the lettuce leaf down over the ingredients.
Take the left side of the leaf and fold it in, then the right side of the leaf and fold it over.
Carefully roll the little lettuce bundle up with the parchment paper. Start from the left corner of the folded edge, tuck in the pointy bottom, and continue rolling until you meet the right corner of the folded edge.