I follow the recommendations of the House Rabbit Society...
http://rabbit.org/natural-nutrition-part-ii-pellets-and-veggies-2/
They get 1/4 of plain pellets daily. [They get this just before bedtime]
Unlimited grass hay (usually timothy or Bermuda) - I refresh it twice daily at least
2+ cups of fresh greens daily (usually basil, romaine, red-leaf, green-leaf lettuce, mint, cilantro, celery, occas. parsley, mustard greens)
The greens they get during our dinnertime, while I'm in the kitchen anyway.
That above is daily. They also get treats occasionally. But, as recommended, they just get a little -- no more than a 1" slice of carrot or of banana, a teaspoon of raisins or craisins.
I also steer very clear of the foods listed at the following from:
http://www.bio.miami.edu/hare/diet.html
NEVER feed your rabbit commercial "gourmet" or "treat" mixes filled with dried fruit, nuts and seeds. These may be safe for a bird or hamster--BUT THEY ARE NOT PROPER FOOD FOR A RABBIT. The sole function of "rabbit gourmet treats" is to lighten your wallet. If the manufacturers of "gourmet rabbit treats" truly cared about your rabbit's health and longevity, they would not market such products.
Don't feed your rabbit cookies, crackers, nuts, seeds, breakfast cereals (including oatmeal) or "high fiber" cereals. They may be high fiber for you, but not for your herbivorous rabbit, who's far better able to completely digest celluose ("dietary fiber") than you are. Fed to a rabbit, the high fat and simple carbohydrate content of "naughty foods" may contribute to fatty liver disease, cecal dysbiosis, obesity, and otherwise cause health problems.