I have a hot - water kettle in my office, and I throw the teapot on at home in the evening so I can bring a sturdy glass of hot water to bed. (bonappetit.com)
When ready to cut, warm a large knife in a glass of hot water. (beantownbaker.com)
It doesn't have heat conductive liquid in the handle or any other method of heating up, so you just put it in the glass of hot water, wait a bit and proceed to scoop. (kitchenbyte.com)