Master the crumb crust — To achieve this key lime pie, you must first craft a stellar crumb crust. Here's how. America's Test Kitchen Master the crumb crust — First grind the crumbs in a food processor. America's Test Kitchen Master the crumb crust — Then use a measuring cup to pack the crumb mixture tightly into the pan. America's Test Kitchen Master the crumb crust — Pre-bake the crust so it holds up better once it's filled. America's Test Kitchen Prev Next