Mashed Roots with Buttermilk & Chives

Serves:

• 2 pounds celery root peeled and cut into 1-inch pieces
• 1 pound rutabaga peeled and cut into 1-inch pieces
• 1 pound Yukon Gold potatoes peeled and cut into 1-inch pieces
• 5 cloves garlic peeled
• 4 tablespoons unsalted butter divided
• 3/4 cup nonfat buttermilk
• 1/2 teaspoon salt
• 1/4 teaspoon freshly ground pepper
• 1/4 teaspoon ground nutmeg
• 1/3 cup snipped fresh chives