Minestrone Soup

INGREDIENTS

• 2 small leeks (or 1 large), white and light green parts sliced thin crosswise (about ¾ cup)
• 2 medium carrots, peeled and chopped small (about ¾ cup)
• 2 small onions, peeled and chopped small (about ¾ cup)
• 2 medium stalks celery, trimmed and chopped small (about ¾ cup)
• 1 medium baking potato, peeled and cut into ½-inch dice (about 1¼ cups)
• 1 medium zucchini, trimmed and chopped medium (about 1¼ cups)
• 3 cups stemmed spinach leaves, cut into thin strips
• 1 (28-ounce) can whole tomatoes packed in juice, drained and chopped
• 8 cups water
• 1 Parmesan cheese rind, about 5 by 2 inches
• 1 teaspoon salt
• 1 (15-ounce) can cannellini beans, drained and rinsed
• ¼ cup pesto (
• or store-bought)