Slab pies turn out to be the perfect solution for cocktail hour. Inspired by a phyllo filling from The Silver Palate Cookbook, I first combined spinach, gorgonzola, and walnuts in my early 20s when I decided to have a cocktail party. I made so much, I spent five days filling and freezing tiny phyllo appetizers. They were devoured and everyone was amazed, but I never did it again. Since then, I’ve shied away from large fussy projects and tend toward simplification. Pie is all that. And this pie is all that and more.