Spiced Braised Lamb with Carrots and Spinach

Name: Spiced Braised Lamb with Carrots and Spinach
Ingredients: 3 1/2 lb boneless lamb shoulder, trimmed and cut into 2-inch pieces; 1 teaspoon black pepper; 1 1/2 teaspoons salt; 1 to 3 tablespoons olive oil; 1 large onion, chopped; 1 celery rib, chopped; 3 garlic cloves, finely chopped; 4 teaspoons ground cumin; 2 teaspoons ground coriander; 2 cups water; 1 (14- to 16-oz) can whole tomatoes in juice; 6 medium carrots, cut crosswise into 2 1/2-inch pieces; 1 1/2 lb spinach, coarse stems discarded; Accompaniments: matzo scallion pancakes and haroseth