• 1 small stalk rhubarb trimmed, washed and cut into 1-inch lengths
• 4 1/2 tbs unsalted butter room temperature, cubed
• 1 cup plus 2 tbs confectioner's sugar
• 1/2 tsp lemon juice

Dough

• 1 1/3 cups plus 2 tbs all-purpose flour Plus 1 tbs for dusting
• 1/2 cup custard powder can use cornstarch
• 1/2 cup plus 1 tbs confectioner's sugar
• 1/8 tsp salt
• 3/4 cup unsalted butter room temperature, cubed
• 1/4 tsp vanilla extract use 1/2 tsp if using cornstarch