This Cuban sandwich with roasted turkey, Swiss cheese, and prosciutto packs some heat with sliced jalapeno and yellow mustard. Between buttered, crispy brioche and crunchy dill-pickles, there are layers of flavor in every bite.
Stir together mayonnaise and mustard; spread mixture evenly over split sides of rolls. Divide turkey, pickles, jalapeno, prosciutto, and cheese evenly among rolls. Close sandwiches and brush tops with butter.
Working in two batches, if necessary, place sandwiches in a nonstick skillet, buttered-sides down. Brush other sides with butter. Top with parchment-lined foil; weigh down with a heavy skillet and cook over medium-low heat until bottoms are crisp and browned, 2 to 3 minutes. Flip and continue cooking, weighted, until cheese melts and bread is crisp, 2 to 3 minutes. Serve immediately with plantain chips.