Multiple choice Pectin is needed to make jam set. Which of these have the highest pectin content? Potatoes, carrots and swede. Apples, blackcurrants and gooseberries. Strawberries, pears and bananas Onions, tomatoes and peppers Reveal answer Fill a bubble to check yourself B Correct answer Explanation Apples, blackcurrants, and gooseberries are naturally high in pectin, which is why they are commonly used in jam making to help the mixture set.