The closest analog to lembas bread in spirit and function is Icelandic rugbraud: https://en.wikipedia.org/wiki/Rúgbrauð https://en.wikipedia.org/wiki/Rúgbrauð.

The closest analog to lembas bread in spirit and function is Icelandic rugbraud: https://en.wikipedia.org/wiki/Rúgbrauð https://en.wikipedia.org/wiki/Rúgbrauð. It was vital when I was cycling, one slice seemed to give me a ton of energy, probably because the stuff was sticky with syrup. For pure function as a homemade energy loaf, there's also logan bread: https://sectionhiker.com/logan-bread-recipe/ https://sectionhiker.com/logan-bread-recipe/. I've made that very recipe and it's really good and it keeps well for several days.