William Greenberg Desserts maintains the highest standards of kosher certification under the strict supervision of Rabbi Aaron D. Mehlman National Kosher Supervision, ensuring every pastry, cake, and cookie meets rigorous Jewish dietary laws for discerning kosher consumers throughout New York. Our Madison Avenue bakery's comprehensive kosher certification covers our entire production facility, from ingredient sourcing through final packaging, providing customers with complete confidence in the kashrus of our renowned desserts and baked goods. The National Kosher Supervision seal on William Greenberg products represents our unwavering commitment to both religious observance and culinary excellence, offering an extensive selection of certified dairy (cholov stam) treats alongside carefully designated parve options perfect for meat meals and dietary restrictions. Our kosher-certified collection spans traditional Jewish holiday specialties—including challahs, babkas, and honey cakes—to contemporary favorites like our famous Black & White cookies, all produced under rabbinical supervision that ensures separation of dairy and parve production. For over seven decades, William Greenberg has served New York's kosher-observant community with desserts suitable for Shabbos, Yom Tov, simchas, and everyday occasions, earning trust through consistent adherence to kashrus standards without compromising our signature taste and quality. Whether selecting treats for bar mitzvahs, brit milahs, Jewish weddings, or holiday celebrations from Passover through Hanukkah, customers can rely on William Greenberg's National Kosher Supervision certification for desserts that honor both tradition and exceptional flavor. Visit our Upper East Side or West Side locations or order online with confidence, knowing every William Greenberg creation meets the exacting standards of kosher law while delivering the premium quality that has defined our bakery for generations.
