Slice fontina cheese & lay on the other side of each sandwich in a single layer.
Slice strawberries, then soak with the balsamic vinegar. Stir so that each slice is amptly covered.
Layer marinated strawberries on top of the fontina cheese.
Carefully put back together.
Use butter or non-stick spray to coat pan. Then, cook over LOW heat for 12 - 15 minutes, flipping halfway through. Make sure cheese is melted and strawberries are heated through.
Let cool for a couple minutes so you don't burn your fingers bringing the deliciousness to your mouth!