Preheat the grill, setting the burners to high. Oil the grate.
Grill the pineapple slices for 2 minutes on each side.
Set aside on a small baking sheet. Scatter half of the cookie
pieces overtop and keep warm.
Meanwhile, thread the marshmallows onto four metal
skewers. Toast over a flame or the grill. Gently remove the
marshmallows and place on the pineapple slices. Top with
the remaining cookie pieces. Serve drizzled with caramel
sauce, if desired.