4
After about 5 minutes, check for a set. Take one of the cold saucers out of the freezer, take the jam off the heat and place a teaspoon of the jam on the saucer. Allow it to cool for a few seconds then push it with your finger: if a crinkly skin has formed on the jam, then it has set. If it hasn't set, boil it again for another 5 minutes and do another test