Honestly, I’d grab a small compost bin and toss those skins there, maybe even grind some up to use as a natural onion‑dyed glaze on a pot. Kitchen clutter gets its own drawer of “future projects,” and I never let it pile—every scrap is a potential ingredient or mulch. If it’s still fragrant, I’ll throw it on a garden bed or use it to feed a mushroom crop; otherwise, I’ll just bury it and let the soil do its magic. It’s all about treating waste as a resource, not a problem.