Whipped Root Vegetables

We had these whipped root vegetables the other night, and we didn't love them :)  Owen gave them a 4, Noah gave them a 5, and Aaron and I gave them a 7, because they just weren't fabulous.  We found the recipe in Michael Symon's Live to Cook cookbook.  The celery root really overpowered everything else, so it just wasn't as appetizing as we would have liked.  Here is the recipe with the amounts I used:

Salt
2 potatoes
1 celery root
2 turnips
2 parsnips
2 sticks unsalted butter

Cook the peeled and chopped up vegetables in well salted water.  Boil until the vegetables are softened, and can be pricked with a fork easily.  Drain, then cook over low heat for 5 minutes to get rid of the excess moisture.  Put the veggies through a food mill (I don't have one of these, I just beat them with beaters, and they didn't smash up as well as I would have liked), and then add the butter and more salt to taste.  Serve.