Heat oil in a medium skillet medium heat.When the oil is hot, add the onion. Sauté until soft and translucent, about 3 minutes.Add the garlic and the jalapeno and sauté for about 1 minute more, until very soft.
Stir in the taco seasoning, tobasco sauce and cook for another minute.
Now add the mashed beans and 1/2 cup of water. Mix the beans and stir until everything combines.
Add salt if needed.
Fill in the taco shells and top with sour cream, lettuce onion and tomato.
