Right. There is no ELI5 for Hawking Radiation - it's too weird. And I am not a Quantum Physicist.

Hawking Radiation is a particular kind of Thermal Radiation that "leaks" from the tiny distance around the Event Horizon of a Black Hole. The radiation never actuallty comes from "inside" the Event Horison, yet it steals energy from the Black Hole - and in a Black Hole, mass and energy are essentially the same thing.

Hawking Radiation itself isn't perfect - and could to the Black Hole Information Paradox - where Black Holes *are* actually deleting information from the universe - although this is up for debate and there are theories which correct for this.

As far as I am aware, you can't turn the energy emitted back in to mass - without just throwing it in to another black hole.