What do you do with coconut refuse?

I've been tossing  coconut husks and shells in the compost. I feel like that's not a very efficient or effective way to use them. What do you all do with them? Thanks!
Mike (south FL, USA)

Biochar!

If you can think of a way to process the hulls, coir is a peat moss substitute (fine) or a great top mulch for plants (coarse/chunky). We use the coarse stuff on top of our tomato barrels to reduce drying out from direct sun.

Coco coir seems to be a premium product in itself. It’s used in hydroponics, gardening, and premium composting. I don’t know if the processing steps of drying, grinding and washing are too much, but as far as I know there is a growing market for it. Even the carbonized material is (or was) considered a high grade material, maybe due to its high specific surface area if I recall correctly.