Elements:
- * 1 cup all reason flour
- * 1/2 teaspoon baking powder
- * 1/2 teaspoon baking soda
- * 1/4 teaspoon salt
- * 1/2 stick unsalted butter, softened
- * 2/3 cup plus 1 1/2 tablespoon sugar, divided
- * 1/2 teaspoon pure vanilla extract
- * 1 enormous egg
- * 1/2 cup smartly shaken buttermilk
- * 1 cup unusual strawberry
- * 1 stalk of rhubarb