1. Preheat oven 350°F. In large bowl beat cake mix, butter and 1 egg with mixer until crumbly. Sir in saltine crumbs. Reserving 2 cups crumb mixture, press remaining crumbs on bottom of greased 13x9-inch baking pan. Bake 15 to 20 minutes.
2. With mixer beat 3 egg yolks, sweetened condensed milk and real lemon juice. Spread over prepared crust. Top with reserved crumb mixture. Bake 25 minutes longer or until set and top is golden.