SOLO Filling Prune, 12 oz cans (Pack of 2) 2 - 12oz Cans of PRUNE PLUM Cake & Pastry Filling by Solo Dried plums are sweetened and cooked slowly to make ready-to-use Solo Prune Plum Filling, the only choice for quick and easy desserts. Another Excellent Product by Solo Foods: Today, Sokol and Company, commonly known as Solo Foods, manufactures a variety of food and baking products under the Solo, Baker, Borden, Chun's and Simon Fischer brands, some of which were obtained through acquisitions. In the more than 100 years since its founding as a Chicago neighborhood grocery store, Sokol and Company is proud to still represent the same dedication to the highest quality products and service set forth by founder, John A. Sokol.