One 3 1/2-pound chicken
1 large onion, finely chopped
1 rosemary sprig
One 4-inch cinnamon stick
1 bay leaf
One 14-ounce package frozen molokhia (see Note) or two 10-ounce packages chopped frozen spinach
1 tablespoon minced garlic
1 tablespoon plus 1/2 teaspoon ground coriander
3 tablespoons unsalted butter
Salt and freshly ground black pepper
1/2 teaspoon ground cinnamon
1/2 teaspoon ground cumin
1/4 teaspoon sweet paprika
Steamed short-grain rice, for serving