Segment the grapefruit and place the segments in a stainless steel bowl. Wearing appropriate protective eyewear and gloves, pour the liquid nitrogen over the grapefruit segments and allow them to fully freeze: the liquid nitrogen will evaporate. Break up the hard grapefruit segments with the end of a rolling pin to produce frozen individual grapefruit cells. Put the frozen cells into an airtight container and freeze until required.
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