I have the same problem trying to get real Korean yuzu or yuja for making Korean tea. It looks a bit like a lemon but its not a lemon. The premade "marmalades" are usually just made with lemons and they are crazy expensive too. You make it in basically the same way as the plum extract but its much thicker/chunkier and i add honey to my Yujacha.
That sounds very tasty! I've never seen yuzu sold fresh or frozen here (San Francisco), but I did hear some farmers markets have them at certain times of the year (Sept - Jan I think). I wonder if that might be the case in your area. I haven't checked the Korean stores yet though because the biggest one is quite far away.
I know they sell pickled yuzu and ume in the Japanese stores, but I expect these would be too off in flavor to use, especially since the ingredients usually list salt. I've seen the jars of tea "jelly" but I've never tried it before.
On a side note its harvest day for my koji based rice wine.. I have nearly 2 quarts of cold fermented, nearly 2 quarts of cold fermented with ginger and about 500ml of room temp fermented. Both the cold fermented are lighter in color. They smell fantastic too.
Interesting! I haven't heard of cold fermenting rice wine before. I'm curious to know your comparisons between the cold fermented and room temperature fermented versions.
I'm just finishing up my first batches of rice wine (various different rices, rice flour, amounts of water, and pureed or not). It's been a lot of fun. Since I had the best results with the traditional method using whole sweet rice, I started a 7 cup dry batch of that today but I'm reusing the rice solids from the last smaller batch for a starter + some additional dry proper starter. Curious to see if that will work well.
All this talk about umeshu has suddenly got me into making extract "wines" with vodka in the same manner as you would make umeshu. (Vodka is a bit cheaper than 35% ABV shochu.) So far I have dried apricot, coconut, and toasted coconut versions going. I may do cherry and raspberry. I'd love to find some small unripe plums and try a plum extract wine with those since I can't find ume, but all the stores around here (including Chinatown) only seem to have the typical large purple or red plums. I guess what I'd be looking for is prune plums. I've considered the dried or pickled plums sold in East Asian grocery stores, but again, they usually have a lot of salt.
Sorry for the thread drift!