Story : Test cook Bridget Lancaster reveals the secrets to making Grandma Pizza at home. Then, tasting expert Jack Bishop challenges host Christopher Kimball to a tasting of tortellini. Next, Bridget shares the test kitchen’s guide to cutting terms. And finally, test cook Julia Collin Davison shows Chris how to make perfect Slow-Cooker Minestrone. Recipes: Grandma Pizza, Slow-Cooker Minestrone Taste Tests: Supermarket Tortellini