This Rhubarb Apple And Strawberry Crumble is a delicious and comforting dessert that is perfect for spring and summer. The filling is made with a combination of tart rhubarb, sweet apples, and juicy strawberries, which are tossed with sugar, lemon juice, and cornstarch. The crumble topping is made with a mixture of flour, oats, brown sugar, and butter, which becomes golden and crispy when baked. Serve this crumble warm with a scoop of vanilla ice cream for a delightful treat.