Alton Brown's Sweet Potato Waffles

Description
Recipe courtesy Alton Brown
 * Contributed by Jenn B aka Mom2Sam and Tiny World Recipes Y-Group

Ingredients

 * 1½ cups peeled and cubed sweet potatoes
 * 2 cups all purpose flour
 * 1 tablespoon baking powder
 * ½ teaspoon salt
 * 6 egg whites, at room temperature
 * 1 cup milk
 * ¼ cup firmly packed light brown sugar
 * ¼ cup butter, melted
 * 1 tablespoon grated orange rind
 * vegetable spray, for waffle iron
 * special equipment: steamer basket and waffle iron

Directions

 * 1) Put cubed sweet potatoes in a steamer basket.
 * 2) Place the basket in a large pot of simmering water that is no closer than 2 inches from the bottom of steamer.
 * 3) Allow potatoes to steam for 20 minutes of until fork tender.
 * 4) Mash cooked potatoes and set aside.
 * 5) In a large bowl, whisk together flour, baking powder, and salt and set aside.
 * 6) In another bowl combine the sweet potatoes, milk, brown sugar, butter, and grated orange rind.
 * 7) Stir the sweet potato mixture into the flour mixture and thoroughly combine.
 * 8) Beat egg whites until stiff peaks form.
 * 9) Gradually fold egg whites into batter ⅓ at a time.
 * 10) The batter will be thick.
 * 11) Using a no.20 disher (scoop), place 2 scoops of batter onto a preheated, oiled waffle iron, and cook until lightly browned, about 5 to 6 minutes.