So I’ve made a bunch of fruit flavored ciders using whole fruit as well as fruit juice. But I’ve seen some good organic all natural fruit concentrates at the natural food store. I was wondering if there is a correlation between the reconstitution instructions on the concentrate and how much to put in a 5 gal. keg of cider. Also, will the amount of fruit flavor needed give me a sweet or dry cider? I usually shoot for 1.008 final gravity.
Flavor may be related to the amounts of fructose and glucose in the fruit but the molecules responsible for flavor are not the sugars themselves, they come from dozens of volatile compounds. As long as your fermentation is not too vigorous many of the flavor molecules will remain in solution. That's why a preferred yeast might not be one that is known to be very aggressive in its action (and so does not blow off all the flavor compounds)
A dry wine or cider means that whatever flavor was in the fruit, all the sugar has been converted to CO2 and ethanol. A sweet wine (or cider) means that a significant amount of the sugars in the fruit (or the must, if you added sugar) remains unfermented. Neither have any real impact on the flavor molecules although your perception of flavor may be changed. More residual sugar in a fruit wine somehow brings forward the fruitiness of the wine or cider.
You can make wines with residual sugar in different ways:
1. by fermenting dry and then back sweetening after stabilization
2. by increasing the amount of sugar beyond the yeast's ability to ferment in an environment so full of alcohol
3. By controlling the nitrogen / nutrients in the must so that the yeast are unable to take up any more sugar and quit while there is still sugar remaining.
There are other ways that brewers talk about - namely pasteurizing the
wine in mid flight but 1) cooked fruit tastes like cooked fruit and 2) heating sealed bottles saturated with CO2 is a recipe for exploding glass. But yer pays yer money and yer takes yer chance.