Sula Rhubarb & Custard Sweets Sugar-Free 42g is free from gluten. Sula Rhubarb & Custard Sugar-Free Sweets have a great taste but they also use new natural ingredients that are free from artificial flavors, artificial colors, hydrogenated fats, aspartame, acesulfame, and preservatives. Sula Boiled Sweets come in a range of flavors to appeal to all tastes, including classic favorites like Caramel Cream, and Strawberry Cream to popular new flavors including Fruit Mix and Cappuccino Cream. Sweets are available in a handy flip-top box for eating on-the-go.