Put the rhubarb into a large bowl, and mix the corn starch with the sugar in a small bowl.
Add the lemon juice to the rhubarb. Next add the sugar and toss to mix evenly. Place the mixture into a pie or baking dish, and set aside.
Make the Topping:
Cut the cold butter into small pieces and then rub into the flour with your hands until it forms small crumbs.
Add the sugars, and oats to the crumble mixture in the bowl and mix well.
Assemble and Bake the Rhubarb Crisp:
Spread the crisp topping evenly over the rhubarb. Place into preheated oven for about 30 minutes.
After half an hour, turn the dish for more even baking. Bake for another 10 to 15 minutes or until the topping is golden brown, and the filling is bubbling.
Serve rhubarb crisp when still hot or warm (it's also good at room temperature) on its own or with a scoop of ice cream, cream or custard. (See custard recipe below this card.)
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