4 minutes ago, TdeV said:
That recipe looks like a huge amount of sugar for not very many grapefruit. Was your jam sweet?
That page was just an example of what the jam looked like. I can't vouch for that recipe.
It was normal jam sweet, not overly. But I did find out she added goji berries and pineapple also, which cut down on the white sugar additions I don't taste the other flavors strangely enough, just a mellow grapefruit flavor. I hate marmalade, so citrus preserves always make me suspect. This is not bitter.