Rhubarb Crumble

What we call “crumble” is what most Americans call a “crisp,” and it’s one of the desserts where we have a lot of common ground: sweetened fruit underneath a buttery topping of flour and sugar, maybe some oatmeal. Serve it warm with whipped cream, or a spoonful of custard, which we eat a lot in Ireland. I particularly love orange with rhubarb, but you can leave the orange, or stir in 1 to 2 cups sl