Hardest Vegetable Part

Listen up, chucklehead. The joke plays on the word "part". You see, it makes you think about the difficulty of eating some gross vegetable, but the punchline is that the hardest "part" of the vegetable to eat is its wheelchair. Because it uses a wheelchair, get it? I bet you didn't because you are dumber than a bag of hammers. Also, the joke implies that the vegetable is disabled, but you probably didn't get that either, you walnut.