Fruitland & Deli 109 Jamacha Road, El Cajon (where 2nd turns into Jamacha at Main) is a fruiteria and makes Lomo tortas. I like them very much, but don't know if they are authentic.
The owner is very proud of her food, bakes the torta bread there daily.
The address below is the other El Cajon location.
Fruitland & Deli
1088 Estes St, El Cajon, CA 92020