Mix the beans and the salsa (if using) in a bowl. Even if not using the salsa, get the beans out of the cans and into a bowl for easier scooping.
Mash the beans quite a bit, you want them pretty homogenous and pasty
Scoop about 1/4 cup of the bean mix onto a tortilla
Top with a big pinch of cheese, fold the tortilla in half pressing to seal it together
Heat a tablespoon of oil in the pan until shimmering
Begin frying the tortillas for about 3 minutes until the first side is nice and crispy, flip and fry the otherside to the same crisp
Repeat frying process, until all tacos are done
Feel free to peel them open and top with fresh onions, pickled onions or any other toppings you love! Serve immediately