Serve with Lars Bolander'sSwedish Meatballs.
Place potatoes, turnips, parsnip, and garlic in a medium saucepan; add enough half-and-half to cover. Place over medium high heat and cook until vegetables are easily pierced with the tip of a knife, 10 to 15 minutes. Drain, reserving cooking liquid.
Return vegetables to saucepan and add egg, butter, and 1/4 cup cooking liquid. Using a potato masher, mash until smooth, adding more cooking liquid as necessary. Season with nutmeg, salt, and pepper and serve immediately.
Raw eggs should not be used in food prepared for pregnant women, babies, young children, or anyone whose health is compromised.