This Warm Rhubarb Cake with Butter Sauce is a comforting and delicious dessert perfect for showcasing tart rhubarb. Made with a tender, lightly sweetened cake base loaded with rhubarb pieces and topped with a rich, creamy butter sauce, this recipe offers a delightful balance of tangy and buttery flavors. Best served warm, it’s ideal for a cozy family dessert or an impressive treat for guests.