This is the stage that you want to get to when making a jam: essentially, it’s when jam becomes jam! I don’t have a candy thermometer, so temperatures don’t really help much. Thank goodness for Martha Stewart!
How do you know that you have reached the setting stage?
1. When you start making your jam, put a glass plate in the fridge.
2. When you suspect that you have reached setting stage (i.e. after 7 minutes in the Cranberry Jam recipe), pull the pot off the burner and put a small dollop of your fruit mixture onto the cold plate.
3. Put your plate in the freezer for about 2 minutes and when you pull it out, if you push the jam with your finger, it should wrinkle. If it does, it means you have reached setting stage – you have jam! If not, you likely need to cook your fruit mixture down a bit more!