On the grill or in a grill pan that is heated, place each slice of the watermelon down and grill for a couple of minutes until you seethe grill sear marks.
Place all grilled slices of watermelon on a large platter.
Sprinkle with Feta cheese crumbles and drizzle the balsamic reduction over all watermelon slices and Feta.
Serve immediately and enjoy!