Nancy Reading wrote:I've tried a couple of times to make rowan jelly, but have both times felt it was a waste of sugar! I just can't get myself to like the taste at all. I even bought some, thinking it might have been something I did, but that was just the same. ...
I have the same problem but found some promising suggestions: In summary, astringency means the fruit isn't ready or fully safe to eat.
First, we need to be aware that Rowan berries contain relatively toxic parasorbic acid (6-methyl-5,6-dihydro-2H-pyran-2-one) which can in extremes cause e.g. kidney damage. We need to convert as much of that as possible to very low toxicity sorbic acid, which also acts as a preservative. (Or grow sweet cultivars:
https://link.springer.com/article/10.2478/s11535-014-0336-8).
Three traditional processes are (1) picking the berries fully ripe; (2) waiting until the berries have had a hard overnight frost on them; (3) bletting them, e.g. picking after a hard frost, then storing in a cool place until the first signs of decay appear; (4) cooking with water.
It seems from a number of sources say you should never eat rowan berries without the first being frozen & bletted: "Chemically speaking, bletting brings about an increase in sugars and a decrease in the acids and tannins that cause the unripe fruit to be astringent."
https://wiki.peekeats.com/index.php?title=Bletting
So those of us living in milder climates probably need
(1) to wait as late as we dare to pick the berries, for maxiumum ripening;
(2) put in the freezer for 24+ hours to simulate a hard frost;
(3) take them out of the freezer & put them in a cool place to defrost & blett for a week or two; and then and only then:
(4) follow your rowanberry recipe.