Adapted from Anne Quatrano's Summerland: Recipes for Celebrating With Southern Hospitality (Rizzoli).
Bring a large pot of water to a boil over high heat; season generously with salt. Add rutabagas, reduce heat to medium, and simmer until tender, 12 to 15 minutes. Drain. Transfer rutabagas to a bowl and toss with butter and nutmeg. Season with salt and pepper; serve immediately.