Steps
1. Heat the olive oil in a saucepan and add the black beans.
2. Add pepper and salt and mix.
3. Cook over medium heat for 15 minutes, stirring frequently.
4. In the meantime, chop the onion and mix it with the barbeque sauce.
5. When the beans are done, remove from heat and place in a bowl to cool down.
6. Take a hamburger bun, place the beans inside and top it with the cheese and the barbeque onion.
7. Put the burger in the oven and heat it for 10 minutes at 200°C.
8. Serve and enjoy!