Nice quick project if you’ve got a coconut handy.  Instructables user marzycielka’s tutorial a good job with the little helpful details, like her trick for removing the coconut meat itself:  Skip the chisel.  Instead,  microwave for 2 minutes, let it cool, and the meat should come out with a spoon.  She’s also prepared her own waterproofing finish by mixing linseed and mineral oils, which should be pretty safe for food use as long as she’s using raw linseed oil.  See this article at Fine Woodworking for more info on food-safe finishes for wood products.

How to Recycle a Coconut Shell into a Bowl