1. Preheat oven to 375 degrees. Pat chicken dry with paper towels and season with salt and pepper. In a large heavy pot, place chicken skin side down and cook over medium until pieces release easily from pot and are browned, about 10 minutes. Flip and cook until browned, 5 minutes. Transfer to a plate.

2. Add onion to pot and cook until softened, about 3 minutes. Add tomato paste and cook, stirring, until fragrant and dark red, about 4 minutes. Stir in 2 cups water, beans, and rosemary; season with salt and pepper. Bring to a rapid simmer. Return chicken to pot, skin side up. Transfer to oven and bake until chicken is cooked through and liquid is slightly reduced, about 20 minutes.