"Deep well" refers to a special form of roast goose. First, dig a dry well underground and pile charcoal. There are iron branches across the wellhead, and the roast goose is hung on these iron branches with hooks and barbecued in the well. Because the well is dug underground and surrounded by airtight soil, the temperature in this deep well is more uniform and stable, so the product is very excellent. This is the origin of roast goose in deep well.