cook your beans, In a pot add your beans, water, onion, garlic and salt. (you can cook your beans on the instant pot for 30-35 minutes, slow cooker for 10-12 hrs on low or on the stove top for around 1 hr or so.
Once your beans are cooked. blend the beans with some of the water. Blended well they need to be runny .
In a big pan add some of the chorizo to cook if you are going to use it, you don't need it but it gives a lot of flavor to the beans. Cook it for 3 minutes or so.
Add the beans that you blended add the cumin and mix well, let it boil for 2-3 minutes. Turn off the stove.
Warm your tortillas and you will introduce your tortilla to cover it with beans both sides, do this step fast so you don't burn your fingers. Put in on your plate like a taco. add some cheese right away so it can melt, Done.
If you want to go to another level, add some sour cream and salsa, You can add some shredded chicken to make it more as a main dish. ENJOY.