Walden Farms Zero Calorie Ketchup. Don't worry, pour it on! Enjoy all the rich, thick Ketchup you want, "The Walden Way," with Walden Farms Calorie Free Ketchup. Made with diced tomatoes, onion and garlic, Worcester sauce and freshly ground herbs and spices...but no calories, fat, carbs, gluten or sugars of any kind. Kosher. Walden Farms Zero Calorie Ketchup is sold in a case pack of six(6) bottles with net 12 oz each.