Although, depending on the era, sourcing all the identical ingredients may be impossible, or nearly so, due to "culinary extinction." Lenore Newman's recent bo

Although, depending on the era, sourcing all the identical ingredients may be impossible, or nearly so, due to "culinary extinction." Lenore Newman's recent book, "Lost Feast: Culinary Extinction and the Future of Food," explores the foods lost to the world. In late 2019, the Gastropod podcast ran an episode with Newman and the "Ghost Foods." https://gastropod.com/of-ghost-foods-and-culinary-extinction/ https://gastropod.com/of-ghost-foods-and-culinary-extinction... Also, it has become very hard to find things such as true buttermilk or real heavy cream that hasn't been ultra-pasteurized, etc.