Part of the fun for me in history research is learning a lot of unexpected bits of information along the way. As I have read journals, letters, and articles, I have often run across information that is just too good to ignore, even if it has nothing to do with what I am looking for.
In my article about the 1873 Mission to the Little Colorado, I had a few of those moments, but perhaps one of my favorites comes from the journal of Andrew Allen, one of the colonists at Moencopie. The 1873 colonists were spread out at several different locations near Moencopie, owing to limitations on the water supply and to avoid creating conflicts with the local Hopi Indians of Chief Tuby. After the group had determined that the Little Colorado basin they had explored that summer was inhospitable, the colonists found themselves waiting for an answer from Salt Lake City and church headquarters that never came. That left them with a lot of free time on their hands, and not much productive work to do before they finally retreated back to Utah.
My great grandmother Charlotte King entertained herself with caring for her year old toddler, Mary, the only child on the trip, and apparently a point of interest for some of the Hopi women. Charlotte gave a woman and her child a red nightgown belonging to Mary, which Charlotte said “pleased them both very much.” 
Some men played checkers, the equivalent, I suspect, of playing Angry Birds, and may have contributed to some of the bad feelings towards the 1873 group. Some actually tried some light gardening, but it was too late in the year to really try growing a real crop. Many interacted with the local Hopis in other ways. Andrew Allen, though, rises to the top of my list with his account.
First, he watched an older Hopi spin wool thread, and provided some wool from an old sheepskin he had with him and let the Hopi show him how the process was done. Allen divided up the resulting thread with a few of his other colonists to bring home to Northern Utah on their return.
A couple of days later, he makes this observation while watching some Hopi women preparing food:
He obtained “some … fresh cid meet [goat or sheep meat]. I got some and appreciated it verry much also … some (what they cal peake) it is made from corn ground fine on rocks and roald out thin yes as thin as paper and then cooked then roald up in to roals, as large as a mans rist and would way about one ounce. I got one of them and brought it home with me. I gave them some I had with me onions, squash, beens, etc.” 
And thus, Andrew Allen, Mormon pioneer and failed Arizona colonist, discovered how to make tacos, paying for it in produce. I haven’t read the rest of Allen’s diary to see if he records ever making tacos for his family back home, so I’m not sure we can credit him with starting a fast food revolution. But it is fun to imagine a drive up window with horse drawn carriages and wagons loaded with families, children eating their tacos, before going to the Draper Ward harvest social and dance. And if little Heber or Eliza started making trouble, Father could always lean back and say “If you don’t stop that right now, you’ll have to clean up after the horses first thing in the morning! Don’t you look at your brother like that!”
 Charlotte Emma Senior King, “A Short Sketch or Biography of Incidents in the Life of Charlotte Emma Senior King,” typescript, nd, LDS Church History Library, 3.
 Andrew Allen’s journal was brought to my attention by fellow Keepaninny Curtis Allen, a direct descendent of Andrew. The date for this reference was June 19, 1873 in his diary.