Kids especially love to do this. E lder berries fresh are just awful, any way you try to cook fresh berries they're no good. Sort of between raisins and prunes. If dried, you can soak and cook them with sugar, make pies, etc. Traditionally, dried berries were mixed with deer meet and tallow, they were also used in soups and stews.
Elder berries are higher in vitamin C than other high-C fruits such as oranges.
They are also a good source of calcium, potassium, and other needed vitamins and minerals. They are really awful-tasting unless the berries are dried. But when they are, they are just about the most nutritious woods fruit there is. T here are various stories about why fresh elder berries taste awful, which maybe I'll tell sometime. I would even forget its name.