Story : Test cook Bridget Lancaster shows host Christopher Kimball how to make Green Chile Cheeseburgers at home. Then, tasting expert Jack Bishop challenges Chris to a tasting of mayonnaise. Next, Chris shares the test kitchen’s top tips on making your own burger. And finally, test cook Erin McMurrer uncovers the secrets to making the best Five-Alarm Chili. Recipes: Green Chile Cheeseburgers, Five-Alarm Chili Taste Tests: Mayonnaise