In a pot, pour 2l water, add the beans and boil them at low fire. After boiling, let it cool down and blend them.
2
Chop and smash the garlic, mix the garlic paste with bean paste.
3
Chop the onion in small pieces, in a pan, add the oil and fry it 1 min. Mix the fridge onion and tomato sauce into the beans paste. Or on top of beans paste.