Step 1: Eat a bunch of nuts
Step 2: Materials
Step 3: Clean shells
You can do this all with your hands, but if you have it available you can use an existing bowl or tuper-ware as a mold and you can line the mold with suran-wrap or parchment paper for easy clean up.
Mix a handful of nuts with about a Tabelspoon of glue to create your mixture. Once the mixture is tacky, push your mixture into your mold or desired shape.
Step 4: Finishing
Remove the bowl from your mold.
Locate weak spots and touch them up with small amounts of glue.
Dry again, and you have a bowl!