The Méndez family, before Ana Darcy became a part of it, being good New Mexicans, had never heard of a "Spanish tortilla." It wasn't long after that Ana (from another planet, after all) joined them, exercising her powerful curiosity about the cuisines of the world. She discovered this simple, savory dish--thanks to her Spanish professor friend, Charo Silva (in Distant Cousin).
The photo above shows most of what one needs to know about it: it's a sort of omelet, with potato cubes and onions sauteed in a pan, and an egg slurry poured over them. There's no need for a recipe here--they are easy to find with any search engine. The picture is worth many words.
The Méndez clan like theirs with their favorite salsa on top, but we have it on good authority that many Spaniards slather theirs with homemade mayonnaise or aioli!
There are many more recipe ideas in the right column under the photo of cranberry-apple pie, including: