01 -
Heat your oven to 350°F and generously butter an 8x8-inch baking dish. Set it aside while you prepare everything else.
02 -
In a medium bowl, whisk together the flour, brown sugar, cinnamon, ginger, and salt until well combined. Pour in the melted butter and stir everything together, pressing with a fork until the mixture forms nice clumps. Let this sit for about 10 minutes to firm up.
03 -
Toss the chopped rhubarb with sugar and flour in a large bowl, making sure every piece is well coated. Let this mixture sit alongside your crumble topping, giving it an occasional stir.
04 -
Spread the rhubarb mixture evenly in your prepared baking dish, making sure to scrape in any remaining juices and sugar from the bowl. Using your hands, scatter the crumble topping over the rhubarb in an even layer.
05 -
Slide into the oven and bake for 45-50 minutes, until the topping is beautifully golden brown and you can see the rhubarb bubbling around the edges. Let it cool for at least 30 minutes before serving - this helps it set up nicely and prevents burnt tongues!