In a large bowl, add the black beans and mash them with the back of a rounded measuring cup.
Shred the zucchini (I did this in a flash with my food processor) and add it to the beans.
Add the remaining ingredients and mix with your hands, until very well combined. Allow to rest for 10 minutes.
Coat a large frying pan with nonstick cooking spray and heat over low. Meanwhile, form the mixture into 5 patties.
Fry each patty a few minutes on one side, until browned. Flip and brown the other side. They can be fried in batches if they don't all fit at the same time.
Serve hot and however you like. We did ketchup and whole grain mustard, but I bet a vegan BBQ sauce would be good as well!