As an example, a rabbit could have 1 egg cup of pellets and a pile of hay per day, plus a selection of vegetables. One day it might be a cauliflower leaf and fresh basil/parsley and another day blackberry leaves, fresh grass and a small carrot.
Grow your own rabbit food! Great website for all sorts of pasture grasses. This particular mix "herbal pasture mix" is a perfect mix for bunnies, containing timothy, orchard grass, alfalfa, multiple types fo clover, and lots of other rabbit favorites. At $6/lb, you can grow enough food to last your bunny forever. I plan on planting this in the entire area where the rabbit hutch, and run will be located, as well as planting specific herbs (cilantro, basil, etc.) in pots to rotate in with her.