It is a rainy day and I was pondering the perpetual question of getting more “apple flavour” into cider, especially with store-bought juice. Here is a left-field "pointy-head" approach to it.
I generally deal with any flavour issue conventionally by playing with malic acid or tannins since adding AJC also adds sugar which will increase alcohol disproportionally. So, I must stress that this is just an idea, I haven’t tried to do it and the arithmetic is a bit rough, but …
Typical cider apple juice is around SG 1.050, which means that using some typical numbers, a litre (say 1000g) comprises something like 870g of water, 110g of sugar and 20g of non-fermentable flavour compounds (acids, tannins, etc).
When it is fermented the 110g of sugar turns into 48% or 53g of CO2 (which goes off into the atmosphere), 48% or 53g of alcohol (which remains in the cider) and 4g of “new” non-fermentable flavour compounds.
So, the end result is 24g or 2.5% of flavour compounds in the remaining 947g of water and alcohol.
Since ethanol “boils” at 173F (80C), what would happen if the alcohol was boiled off and the “cider” simmered until the volume was reduced to say ½ litre? I have no idea how long this would take or if 80C would introduce a cooked flavour.
My guess is that the ½ litre would still have the original 24g of flavour compounds which is now at a concentration of 4.8%, double the original concentration. You end up with a form of AJC without the sugar. Voila, adding this non-fermentable “flavour concentration” to a litre of the original cider increases the flavour concentration from 2.5% to 3.3%, or an increase of 25% which would probably make a substantial difference to the “apple flavour”.
Sure, there are all sorts of combintions of volumes, alcolol boiled off – alcohol not boiled off, etc, but maybe some brilliant biochemist might be able to comment on whether this approach would work or not. It might even be a way to make low-alcohol cider without sacrificing flavour??? Something to think about over Xmas!
Cheers!