If I want to make - I don't know - strawberry jam, I'm going to have to add something to strawberries to make it gelatinous and thick, right? I'm going to have to add pectin or something like that.But if I want to make cranberry sauce, all I have to do is pop some cranberries in a little saucepan and when it cools off, it'll be thick and gelatinous. So what's up with cranberries?