Rhubarb Crumble

Possibly the best dessert in the entire world! Tart, sweet, and with the best crumble topping I have made yet. I usually halve the recipe but I am including the full amount here. It is from Nigella Lawson's cookbook "Feast". It can be made in advance (the crumble topping separate from the rhubarb) and stored in the fridge or freezer. You don't need to thaw the topping before proceeding.

• Ready In: 1 hr 10 mins
• Serves: 10

Ingredients

• 2  lbs rhubarb, chopped into 1/2 in pieces
• 1⁄4 cup sugar (superfine)
• 1  tablespoon butter
• 1  tablespoon vanilla extract
• 1  tablespoon cornstarch

• For the Crumble Topping

• 1  cup all-purpose flour
• 1  teaspoon baking powder
• 1⁄2 cup unsalted butter, cold and diced
• 3  tablespoons  vanilla sugar (can substitute ordinary sugar)
• 3  tablespoons brown sugar

Directions

1. Place a baking sheet in the oven and preheat the oven to 375°F
2. Heat the rhubarb in a pan on medium to medium low with the 1/4 sugar, 1 T butter, vanilla, and cornstarch for about 5 minutes, until the rhubarb is glossy and everything has melted together. Transfer to an 8 1/2 in pie plate (approx. 1 1/2 in deep).
3. To make the crumble topping, place the flour and baking powder in a bowl and rub in the butter until it is thoroughly combined, with a texture like soft crumbs.
4. Using a fork, stir in the sugars. Spread evenly over the fruit, attempting to cover all of it. (Exposed parts will bubble up). Bake on the sheet for 35-45 minutes. It's okay if it bubbles over a bit, this is what the pan is for.).