1. Preheat oven to 200 degrees with rack in center. Line a rimmed baking sheet with parchment. Transfer to the oven. Heat a waffle iron. Sift flour, curry powder, baking soda, baking powder, sugar, and salt in a bowl.

2. In a medium bowl, whisk egg yolks, buttermilk, and butter. Pour into dry ingredients; stir until just combined.

3. In a medium bowl, beat egg whites until stiff but not dry. Fold into the batter.

4. Pour about 1 tablespoon batter onto each section of the waffle grid. Close lid; bake for 3 minutes, or until no steam rises from iron. Transfer waffles to baking sheet in oven until ready to use.