2 teaspoons extra-virgin olive oil  | 
                                                1 cup chopped onion  | 
                                                1 cup (1/2-inch) slices leek  | 
                                                1/2 teaspoon ground coriander  | 
                                                1/2 teaspoon caraway seeds, crushed  | 
                                                1/8 teaspoon ground cumin  | 
                                                1/8 teaspoon ground red pepper  | 
                                                1 garlic clove, minced  | 
                                                3 2/3 cups simple vegetable stock, divided  | 
                                                2 cups (1-inch) cubed peeled butternut squash  | 
                                                1 cup (1/2-inch) slices carrot  | 
                                                3/4 cup (1-inch) cubed peeled yukon gold potato  | 
                                                1 tablespoon harissa  | 
                                                1 1/2 teaspoons tomato paste  | 
                                                3/4 teaspoon salt  | 
                                                1 pound turnips, peeled and each cut into 8 wedges (about 2 medium)  | 
                                                1 (15 1/2-ounce) can chickpeas (garbanzo beans), drained  | 
                                                1/4 cup chopped fresh flat-leaf parsley  | 
                                                1 1/2 teaspoons honey  | 
                                                1 1/3 cups uncooked couscous  | 
                                                8 lemon wedges  |