Lebanese Lamb and Bean Stew

Cover beans with cold water by 3 inches in a bowl and soak at room temperature at least 8 hours. Drain well in a colander.
Bring lamb, baharat, and water (9 cups) to a boil in a 6- to 8-quart heavy pot, then vigorously simmer mixture, covered, until meat is almost tender, 1 1/4 to 1 1/2 hours. Add beans and cook, uncovered, until beans are tender, about 1 hour more. Meanwhile, heat oil over moderate heat in a 12-inch heavy skillet until hot but not smoking, then cook onions, garlic, 1/2 teaspoon salt, and 1/4 teaspoon pepper, stirring, until onions are pale golden and tender, 8 to 10 minutes. Stir in tomato paste and cook, stirring, 2 minutes. When beans are tender, stir in tomato-onion mixture and simmer until just heated through, about 5 minutes. Stir in remaining 1 1/2 teaspoons salt and 1/2 teaspoon black pepper.
*A Middle Easterna and African ground-spice mixture that typically contains allspice, cinnamon, clove, cumin, Maras chile, and black pepper. Available at Middle Eastern markets and Formaggio Kitchen (888-212-3224; formaggiokitchen.com).