In comments to the last post pdf23ds links to an informative Wikipedia article about sopaipillas. It explains, among other things, the rather odd spelling of the term; it’s pronounced as if it were spelled “sopapilla” (and commonly spelled that way in Texas according to pdf). It turns out the spelling is due to it being a diminutive of sopaipa, itself a diminutive of the Mozarabic word suppa “bread soaked in oil.” It’s interesting to see that Mozarabic, a Romance language, had adopted the distinctive Arabic diminutive pattern, and it’s also interesting to see how semantic change over time apparently led to two instances of the diminutive form supplanting the original. The pronunciation has now changed so that the i is superfluous, but the spelling retains it as a vestige of Arabic grammar.
As for the item itself, as the article says it’s a staple of New Mexican cuisine but unknown elsewhere in the Hispanic world (although the same word is apparently used for a different thing in South America). If you go into a Mexican restaurant anywhere in New Mexico, there will be a bottle of honey on the table. An entree generally comes with a sopaipilla, and at the end of the meal everyone’s sopaipillas are brought to the table in a basket. Standard procedure is to bite off one corner and pour in some honey, then eat the thing carefully, trying not to spill too much of the honey. It can get rather messy. Stuffed sopaipillas are also common entrees available at many (though not all) restaurants. The filling is basically the same as what you’d get in a burrito. This is what we ordered at the restaurant we went to the other day.
Sopaipillas tend to vary in quality a lot from restaurant to restaurant. There’s a place near my house that has excellent ones, light and crispy, but at many other places they’re heavy and dull, more a perfunctory part of the mealtime ritual than an item given particular attention. I’m not surprised that pdf hasn’t had any good ones in Texas.
New Mexican cuisine is distinctive in many ways, and quite different from Tex-Mex and California Mexican fare (and, for that matter, from the various regional cuisines of Mexico itself). The sopaipilla is just one of the most noticeable examples of a culinary feature unique to New Mexico. You really have to come here to get a good one, but it’s totally worth it.