Step 1

Place a steamer insert or a mesh colander in a large pot and add enough water to reach the bottom of the steamer. Place the sweet potatoes in the steamer and bring the water to a boil. Cover the pot, lower the heat, and cook over simmering water for about 25 minutes, until very tender. Check occasionally to be sure the water doesn't boil away.

Step 2

Transfer the sweet potatoes to the bowl of an electric mixer fitted with the paddle attachment. With the mixer on low, slowly add the half-and-half, orange zest, orange juice, cayenne pepper, 1 tablespoon salt, and 1 teaspoon black pepper. With the mixer still on low, add the butter, 1 tablespoon at a time, until incorporated. Taste for seasonings and mix until smooth. Serve hot.