Test cook Bridget Lancaster reveals the secrets to a Texas favorite, Tres Leches Cake. Then, tasting expert Jack Bishop challenges host Christopher Kimball to a tasting of sweetened condensed milk. And finally, test cook Julia Collin Davison shows Chris how to make Magic Chocolate Flan Cake. Recipes: Tres Leches Cake, Magic Chocolate Flan Cake Taste Tests: Sweetened Condensed Milk