A gazyr is an implement to hold a rifle charge: a tube with a bullet and a measure of gunpowder or a paper cartridge. They were carried in gazyr bags or in rows of small pockets on the breast. Later, gazyr pockets became a distinctive element of national dress of the peoples of Caucasus, such as the chokha.
The portal in which gravy flows into the roll, therefore making it a gravy roll. Gravy roll, think of it as a jelly-filled donut, but instead of the jelly, it’s gravy, and instead of a donut, it’s a roll. Best enjoyed during a holiday dinner.