Image shows a sheet with a hole in it, there's a green backing fabric for stabilization, it is stretched over a small embroidery hoop. There are also Clover brand embroidery needles, a block of beeswax for conditioning the thread, and gold, sashiko embroidery thread.
Image shows the sheet with the hole in it with the green backing fabric and the gold thread back stitched around the hole. It is still stretched on an embroidery hoop.
The not so pretty back of the work, the green stabilizing fabric has been cut away with pinking shears. The stitches are a little messier than the front side, but this is the backside of a satin stitch.
The front of the sheet with the hole mended, and the embroidery hoop removed, you can see the gold thread has been satin stitched around the open hole, revealing a green center.
My favorite sheet has a hole in it, so what's a gal to do but mend it, right?!?
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(the steps I took are kind of included in the alt text!)