Patio tomatoes in containers are fun and easy.
Fruit trees are ornamental, and with a minimum of care, produce a LOT of food. Berries and grapes are very satisfying as well, you can get a lot of juice to freeze and use throughout the winter. I used to make jellies, but now stick to juices, because they’re better for you.
It's pretty much the only thing I've had any luck with, since we live with deer and rabbits aplenty. The losses in shrubbery alone are in the thousands. All flowers must be place on hangers and lowered to be watered, or in second-story windowboxes. They even tear up crysanthemums and marigolds, two things they're not supposed to like, right out of the ground. My hydrangea, arbor vitae and holly are eaten down to a nub. The only plants I've had any luck with are catnip, pampas grasses and boxwood, but they will eat anything if they are hungry enough. They will rip out wire fences and tear down birdfeeders and lick them.