I use 23k gold leaf for my calligraphy and illumination work. It is genuine gold but it’s rolled extremely thin (to the point of translucency when held up to a light). right now the going rate is $57.95 for 25 3.5” x 3.5” sheets or $2.32 x sheet so yes the doughnut maker can say he’s using real gold but that’s quite a mark up for a $100 doughnut.
How does it taste?