Cut the tomatoes and mozzarella into thin slices. Boil the asparagus.
Make slits along the fillet and turn the chicken out. Season the fillets with salt and pepper to taste and brush each piece with olive oil.
Place tomatoes on one half of the fillet and top with mozzarella and basil leaves. Cover the filling with the other half of the meat and then secure with skewers.
Place the pieces in a mold and bake at 180°C in the oven for about 30 minutes.