Kue Rhubarb Gula Kayu Manis

Bahan-bahan (12 porsi)

• ½ cup unsalted butter (softened)
• ¾ cup gula pasir
• ¾ cup gula merah
• 1 large telur
• 1 teaspoon vanila
• 1 Tablespoon lemon zest
• 2 cups all purpose flour
• 1 teaspoon soda kue
• ¼ teaspoon garam
• 1 cup dadih
• 3 heaping cups chopped rhubarb
• 1/3 cup gula pasir
• 1 tsp kayu manis