Mashed Turnips and Parsnips

Bahan-bahan (10 porsi)

• 2 pounds turnips (peeled and chopped)
• 1 pound parsnips (peeled and chopped)
• 1 g ranny smith apple (peeled, cored and chopped)
• ¼ cup butter
• ¼ cup heavy whipping cream
• salt and pepper to taste