This is an absolute best version of the Polish Fruit Soup recipe. Eating sour cherries straight off the tree was always such a delicious challenge. These dark red, soft fruits are so juicy and soft. The first few bites would throw my salivary glands into a frenzy – if you’ve ever had sour cherries, you know exactly what I mean. But strawberries are in season and paired with rhubarb they will deliver the slightly sour, sweet and creamy taste of fruit soup similar to sour cherry fruit soup.