Apparently, there is a First Viennese Vegetable Orchestra. They play about 20-30 concerts a year and have 11 musicians, 1 video person and 1 sound technician. And yes, all of their instruments are made out of actual vegetables: "carrot flutes, pumpkin basses, leek violins, leek-zucchini-vibrators, cucumberophones and celery bongos." After the end of each performance, the vegetables are made into a soup and served to the audience.
Here is a video of a performance. Here is an audio clip. And here are pictures of their instruments.