Whole Wheat Rhubarb Scones

INGREDIENTS

1/2 cup

unsalted butter, at room temperature

2 cups

whole wheat flour (or white whole wheat if you prefer a milder taste)

2 tbsp

granulated sugar

2 tsp

baking powder

1 tsp

cinnamon

1/2 tsp

baking soda

1/2 tsp

kosher salt

1/2 cup

diced rhubarb (or the fruits, nuts, and/or chips of your choice)

1/2

cup, plus 2 tablespoons cold buttermilk, plus 1 additional tablespoon as needed

3 tbsp

boiled cider*

large egg, separated

Sparkling sugar, optional