INGREDIENTS
1 lb
Rhubarb
2
Eggs, large
1 1/2 cups
All-purpose flour
2 tsp
Baking powder
1/4 cup
Confectioners' sugar
1 1/2 cups
Granulated sugar
1 3/4 tsp
Salt, coarse
1 1/4 tsp
Water or pure vanilla extract, orange blossom
1/2 cup
Pistachios, unsalted
2 cups
Whole-milk yogurt, plain
1 stick
Plus 1 tablespoon unsalted butter, room temperature, plus more for pan