Rhubarb and Coconut Crumble Slice

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I have one thing to say about this cake. It made me do something I have done never before. Never. Before. I had just taken the first photo, picked up a knife to cut out an artful slice. Before I knew what was happening my camera had been flung to the side, I had grabbed a plate and was eating an enormous piece right there in the morning sunshine. It was glorious. 
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The base is a buttermilk cake that bakes into a deep, golden yellow full of lemon zest and cinnamon. On top of this, fresh rhubarb is chopped up with sweet and crisp apples. This is tossed with sugar and lemon juice so that it bakes into a sweet, jammy, tart centre. What makes this cake perfect though is the coconut and brown sugar topping, that bakes into a deep brown crunchy crumble. I ate it while it was still warm and the fruit juices were just starting to set into a ruby jelly around the edges. I made it to last a few days, and I’m sure it would have tasted lovely the next morning with some tea. Unfortunately everyone that’s walked through the door has taken one look and demanded a slice, and then looked up with exactly the same look of “whaaat is this slice TALKIN ABOUT.” Eight hours later there’s hardly any left.
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I read about this delicious recipe on Smitten Kitchen, and was drawn to it because of the huge bunch of rhubarb we had. Family friends recently gave us a bag full of lemons from their tree. The zest was so fragrant I increased the amount to two teaspoons and added lemon juice to the rhubarb and apple. The coconut in the topping was a little bit of an experiment, but I’m so glad I tried it. It makes the crumble chunky and crispy, and adds a tropical flavour. If you don’t have any rhubarb, stone fruits would work well instead. Apples could be nice except the sugar would have to be reduced, otherwise it might end up too sweet.
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Rhubarb and Coconut Crumble Slice: Adapted from here

500 grams (17.5 ounces, 1 pound) rhubarb, cut into 1cm chunks

2 small apples, peeled and cut into chunks

2 tsp lemon zest and the juice of the whole lemon

150 grams (2/3 cup) sugar + 100 grams (1/2 cup) sugar, separate

2 large eggs

110 grams (1 stick, 4 ounces) butter

165 grams (1 + 1/3 cups) plain flour

1 tsp baking powder

1 tsp cinnamon

100ml (1/3 cup) buttermilk 

Toss the apple, rhubarb, sugar and lemon juice with 150g of the sugar and set aside. Preheat the oven to 165C and line a 20 by 25cm pan (also works with slightly larger) with baking paper so that the edges are overhanging. Beat the sugar and butter together until fluffy and light and slowly add the eggs one at a time. Whisk the flour, baking powder and cinnamon together and stir half into the mix, than stir in half the buttermilk. Repeat and mix until just combined. Pat into the pan with a spatula and pour the fruit on top evenly. 
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Topping:

50 grams plain flour

85 grams fine desiccated coconut

1 tsp cinnamon

50 grams brown sugar

55 grams butter, melted. 

Stir all the ingredients together until lumpy and toss over the fruit. Bake for 40-50 minutes until the top is golden and the cake is no longer crumby on a skewer. Allow to cool so the fruit is set before removing from the pan and cutting into slices. 

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2 thoughts on “Rhubarb and Coconut Crumble Slice

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