1 1/2 c Diced turnips - frozen or fresh 2 Granny Smith apples - peeled, cored - and roughly chopped 1 lg Onion - peeled and roughly chopped 1 tb Unsalted butter 1/2 ts Salt; or as desired 1/4 ts Ground white pepper PREHEAT OVEN TO 350F. Peel and quarter fresh turnips. Do not bother to defrost frozen ones. Combine all ingredients in a baking dish with a cover. Cover and place in the oven for 35 minutes. Remove from oven, transfer contents of the baking dish to a food processor and puree until smooth. Spoon the puree into a serving dish. Serve immediately.