I started selling make-at-home frozen dog treats: https://coopersdogtreats.com/. It's pretty sweltering here in San Diego, so I wanted to make frozen treats for my dog, but all the recipes online are mainly yogurt (which he hates) or peanut butter (which I use to feed him his flea pills, so he flees when he smells it now).

I started by putting some freeze-dried meat into a food processor until it became a dust, then I started adding some other ingredients for flavor/smell/consistency. I was really happy with the results, so I thought I'd try selling them! So far just a few sales, but I haven't done much marketing to this point.