Summer Berry Cake for a Swedish Midsummer Celebration - like a crayfish parties, except for the pole dancing. We cook, we eat, we drink, we sing. Instead of crayfish, most people eat pickled herring and small homegrown potatoes. We had prepared vegetable muffins, this time loaded with goat cheese, broccoli and olives. We also made a no-bake summer cake topped with freshly picked wild strawberries and blueberries.