1. Using the apple corer, insert 1/3 of the way into the radish then use a paring knife, cut into the radish until it makes contact with the apple corer. Continue to cut around the radish.
2. Cut the middle of the segment and remove. Carefully remove the apple corer. With the paring knife, shave off excess skin at the bottom of the radish.
3. Using an icing piping tip, indent circles around the top of the radish. then use the paring knife, cut circles around the indentations. Repeat until you reach the desired look of your mushroom.