Ingredients
Method
Preheat oven to 350°F and grease an 8x8-inch baking dish.
Spread the chopped rhubarb evenly in the prepared baking dish.
In a bowl, whisk together flour, granulated sugar, baking powder, and salt. Stir in milk, melted butter, and vanilla until combined.
Spread the batter over the rhubarb layer.
Mix brown sugar and cinnamon together, then sprinkle evenly over the batter.
Slowly pour the hot water over the entire dish. Do not stir.
Bake for 40–45 minutes, or until the top is golden and the cake is set.
Cool for 15 minutes before serving warm.
Notes
Store covered in the refrigerator for up to 4 days. Frozen rhubarb can be substituted if thawed and drained first. Serve warm with vanilla ice cream or whipped cream for the best texture and flavor.
