What is Pas Yisrael?
Pas Yisroel or Pat Yisrael (Bread of an Israelite) products are grain-products that were cooked or baked with the participation of an observant Jewish person. This must be, at minimum, the ignition of the flame used to prepare, cook, or bake the grain product.
In classical Rabbinic Judaism, this requirement is considered restricted to the five classical grains of Judaism – wheat, barley, oats, spelt, and rye. In the modern food-production industry, commercial bakeries may accomplish a status of Pas Yisroel by the use of something called the “shain system”, (named for the inventor, Rabbi Yehuda Shain) whereby an entire apparatus can be ignited remotely by an observant Jews