Seagar lives in the small town of Oxford in North Canterbury, with her husband Ross.

[2] She initially trained as a nurse, and attended Le Cordon Bleu cookery school in London while working at the Royal Free Hospital.

[3] Back in New Zealand, Seagar opened Harley's Restaurant in Auckland with fellow nurse Helen Brabazon.

[3][8] Seagar is patron and ambassador for Hospice, and raises money for the charity through cooking classes.

[2] In the 2015 New Year Honours, Seagar was appointed a Member of the New Zealand Order of Merit, for services to the community.