Chickpea Tagine

Ingredients

• 1 cup dried chickpeas, soaked overnight and drained
• 1/4 teaspoon saffron threads
• 1 quart plus 2 tablespoons water
• 1 large onion, finely diced
• 2 garlic cloves, thinly sliced
• 1 tablespoon unsalted butter
• 2 tablespoons extra-virgin olive oil
• 2 teaspoons ground cumin
• One 3-inch cinnamon stick
• 1/4 teaspoon crushed red pepper
• 1/2 pound butternut squash, peeled and cut into 1-inch dice
• 2 medium red potatoes, peeled and cut into 1-inch dice
• One 14.5 ounce can whole tomatoes, drained and chopped
• Salt
• 2 small zucchini, diced
• 1 tablespoon minced preserved lemon rind
• Freshly ground black pepper
• 3 tablespoons chopped cilantro leaves
• Yogurt and harissa, for serving