Finely grate gruyere cheese onto parchement or freezer paper in a circle about
4 to 5" in diameter, covering the paper so you can't see the paper through the cheese. Microwave on high for about
30 seconds. (Here is where you might need to tweak it because microwaves are all different.) The cheese will look sizzling just on the verge of browning. Carefully lift the cheese from the edge and it should come off the paper as one whole circle. Immediately place the cheese over the bottom of an upside down juice glass and gently hold the cheese to form around the glass. In about
1 minute it should be cool and stiff. Take it off the glass and place it on a salad plate. Now you can fill it with anything you want: chicken salad, guacamole, shrimp salad, shredded lettuce salad, or whatever you want.