Host Julia Collin Davison goes into the test kitchen with host Bridget Lancaster to reveal the secrets to making Home-Corned Beef with Vegetables. Then, tasting expert Jack Bishop challenges Bridget to a tasting of sherry vinegar. Next, science expert Dan Souza uncovers the science of salt diffusion and nitrites. Finally, test cook Elle Simone shows Julia how to make the ultimate Snickerdoodles.