There's nothing quite like the comfort of a homemade beef pot pie on a chilly evening. I've been making this version for years, and it's become one of those recipes that transforms leftover beef stew into something completely special. The key is using really good beef stock (homemade if you've got it) and not rushing the filling. Pot pie has British roots, but it's found its way into Jewish kitchens across America with some clever adaptations. Since we can't use butter in the traditional pastry when serving with meat, I've perfected a pareve crust that uses margarine and gets just as flaky and golden. The trick is keeping everything cold and not overworking the dough. What makes this pot pie work so well is the balance between the rich, savory filling and that crisp top crust. I brown the beef first to build flavor, then simmer it low and slow with vegetables until everything's tender. The gravy thickens naturally from the flour and stock, creating that perfect consistency that holds together but isn't gummy. Don't skip the step of letting the filling cool completely before assembling. Hot filling will make your bottom crust soggy. This serves six generous portions and pairs beautifully with a simple green salad or roasted Brussels sprouts. It's perfect for Shabbat dinner when you want something hearty but not too heavy. The whole thing can be assembled a day ahead and baked when you're ready to serve.