Black Bean and Bacon Flautas (Crispy Rolled Black Bean and Bacon Tacos)

(12 slices) bacon

medium white onion, chopped

black beans, mostly drained

large jalapenos en escabeche, stemmed & finely diced

sea salt

corn tortillas

vegetable oil, for frying

large leaves romaine lettuce

cider vinegar

tomatoes, cored & chopped

queso fresco, crumbled