Classic Minestrone

Name: Classic Minestrone
Ingredients: 3⁄4 cup leek, white and light green parts sliced thin crosswise; 3⁄4 cup diced carrot; 3⁄4 cup diced onion; 3⁄4 cup diced celery; 1 1⁄4 cups diced baking potatoes; 1 1⁄4 cups diced zucchini; 3 cups spinach leaves; 1 (28 ounce) can whole tomatoes, packed in juice, drained, and chopped; 8 cups water; 1 pinch salt; 1 (15 ounce) can cannellini beans; 1⁄4 cup basil pesto (or 1 tablespoon minced fresh rosemary mixed with 1 teaspoon minced garlic and 1 tablespoon extra-vir); 1 pinch ground black pepper