Place the block of aged feta in the freezer for 2 hours or until firm enough to shave. Wearing appropriate protective eyewear and gloves, pour the liquid nitrogen into an insulated bowl or a small styrofoam container.
Remove the frozen feta and use a Japanese mandolin to shave 4–5 slices, as thinly as possible, into the bowl of liquid nitrogen. Allow the liquid nitrogen to further freeze the cheese for 30 seconds. Remove with a slotted spoon, put in an airtight container and store in the freezer. Repeat until all the feta has been used.
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