Special Delivery tetracycline mouthwash formulation Add 2 cups broth and scrape bottom of pot to loosen and dissolve fond. Add remaining 2 cups broth, reserved squash liquid, 1 cup water, thyme sprigs, bay leaf, and cayenne. Increase heat to high and bring to simmer. Reduce heat to medium and simmer until leeks are fully tender, 6 to 7 minutes.