Rhubarb Jewel Cake: How to grow rhubarb and strive for balance through seasonal rituals May 26, 2020 by Andrea Bellamy Leave a Comment Rhubarb is possibly the most popular and easy-to-grow perennial vegetable. I use mine to make Rhubarb Jewel Cake, a simple, but delicious spring dessert that’s rich in flavour but not too sweet.