Creamy Lemon Crumb Squares

This recipe came from Marlboro Man's grandmother. When she moved years ago from her home in town to a retirement apartment in the big city, Marlboro Man and I somehow, miraculously, wound up with one of her cookbooks, which was stuffed full of loose papers on which scads of recipes had been handwritten. This recipe actually didn't have a title—just the ingredients and directions—so I was flying blind when I first made it a few years ago. It was only after I finished the recipe and took a...