@madamscientist It’s very common, both warm and cold. I often buy it ready made, also powder is common. Many pick by themselves, wild growing, but I have never done it. Dry them. I prefer to buy as flour made by the peel, so I can add (less) sugar myself, plus eg potato flour, water and boil a few minutes. Very C-vitamin rich. Can also be more dessert like with ex ice cream in the warm soup. Here is one variant, Sara lives in my home town area. https://www.sarabackmo.com/recipes/homemade-swedish-rosehip-soup/