The small asterisks that appear by some fruits and then appear again in the measured ingredients column of that recipe (next to ¼ cup lemon or lime juice) are telling you that the fruits with the asterisk, like Sweet Blackberry, require the ¼ cup lemon or lime juice. The addition of lemon or lime juice is required for canning safety, and sometimes for jelling.
Pomegranate is a special case. It doesn’t require the ¼ cup lemon or lime juice, but some people feel the addition of a small amount of lemon juice improves the pomegranate flavor. So we offer the option of adding 4 teaspoons of lemon juice to your pomegranate jelly.
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Posted in: 3. Questions About How to Use Pomona’s Pectin