To make one of these cheese bowls, find two small bowls that fit snugly inside each other. Line a large plate with a circle of parchment paper. Spread a thin layer of finely grated parmesan in a circle on the parchment, making the circle slightly larger than the size of the bowls. Microwave until melted, about 2 minutes. Quickly pick up the parchment and drape it, cheese-side up, over an upside-down bowl; immediately top with the other bowl and let cool 2 minutes. Remove the top bowl, invert the frico bowl and carefully remove the parchment. Let harden 30 minutes, then fill with salad.