Quick update: I took a jar along on our recent trip to Nagano Prefecture with One Life Japan. They invited us to stay at their house and help on the farm, so I thought it would be a good little gift. We ate it at breakfast our first morning there, and it was a wee bit nerve-wracking. Their homemade bread was hot from the stove, and two other guests were dying to get rolling. Everyone oohed and aahhed over the idea of the marmalade, and took an obligatory spoonful.
As they munched, they mumbled nice things around the mouthfuls. It seemed good, but Japanese or English it was a little hard to understand. Then came the moment of truth. The woman across from me, a total stranger, took a huge helping of SECONDS!!
The marmalade was good. And the jar was mostly empty by the time we left. Another good sign!