hi I'm chef Mario today I'm going to show you how to make a crumble topping for rhubarb crumble to get started you'll want to pre-heat your oven to 350 degrees then you want to get your rhubarb this is about three cups and you can either use fresh or frozen just rinse and cut up the rhubarb into slices then add a half a cup of sugar and a quarter teaspoon of cinnamon mix everything together and then put it in a 9-inch round now I'm just messes aside while I make my crumble topping in a mixing bowl you want to add 1 cup of flour 1 cup of brown sugar one cup of rolled oats a pinch of salt and then a half of cup or a cube of melted butter now just mix all the ingredients together until it forms a crumbly consistency now I'm just going to put my crumble topping on top of the rhubarb spread the crumble mixture over the rhubarb until it reaches the size this is chef Mariko showing you how to make a crumble topping for rhubarb crumble enjoy you