Just read this one on mse and it made me laugh .....
"If any of you have access to a vegetable market stall, they often chop off the surplus cauliflower stalks and toss to them one side. Ask them if you can have some for your (invisible) rabbit. They are excellent chopped up and cooked in with other mixed vegetables, simmered in water to make stock or gravy or chopped up and included in minestrone and vegetable soups".