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Exists in two main variations: A 求肥-like variation, and one where 味噌 paste is piped into a hollowed out ゆず. The latter, I think, makes for a very nice 八寸!
Stuffed ゆず
Fill lemons to ¾ (that's about 100 gr in a decently sized Amalfi lemon)
Steam for 1 hour
Dry for 1 month (but check every now and then, lest it dries out too much). There's a problem of case hardening akin to cured meat if you dry it in too dry an environment, so I'm using our cellar at 60% RH.