Test cook Bridget Lancaster uncovers the secrets to perfect Poached Fish Fillets with Sherry-Tomato Vinaigrette. Then, science expert Guy Crosby explains the science of poaching in oil. Next, tasting expert Jack Bishop challenges host Christopher Kimball to a tasting of oyster crackers. Then, test cook Julia Collin Davison shows Chris how to make foolproof Easy Salmon Cakes at home. And finally, equipment expert Adam Ried reviews oyster knives in the Equipment Corner.