Mozzarella House products are available at Salumeria Italiana, 151 Richmond St., North End, 617-523-8743; Salumeria Toscana, 272 Hanover St., North End, 617-720-4243; A. Russo & Sons, 560 Pleasant St., Watertown, 617-923-1500; and Butcher Boy Meat Market, 1077 Osgood St., North Andover, 978-688-1511.