Method
Drain and rinse beans; drain well. Set aside.
Cook onion and garlic in oil over medium heat until soft, about 5 minutes. Stir in 1/2 cup bread crumbs.
Put into food processor with drained beans. Add tomato paste, cheese and vinegar; process until smooth. Add capers and process with a quick off and on motion. Add more bread crumbs if mixture seems soft.