Lamb and Sweet Potato Shepherds Pies

Name: Lamb and Sweet Potato Shepherd's Pies
Ingredients: 3 tablespoons extra-virgin olive oil; 2 pounds boneless lamb shoulder, cut into 1/2-inch pieces; Salt and freshly ground pepper; 4 garlic cloves, minced; 1 medium onion, finely chopped; 2 carrots, cut into 1/2-inch dice; 1 1/4 teaspoons ground cumin; 1 1/4 teaspoons hot paprika; 1/2 teaspoon ground allspice; 1/4 teaspoon turmeric; 1 1/2 tablespoons all-purpose flour; 3 1/2 cups water; 5 cups baby spinach (3 ounces); 2 pounds sweet potatoes, baked and peeled; 1 1/2 ounces soft goat cheese; 1/2 cup milk; 1 tablespoon unsalted butter