The Sterns think Kopp's Custard in the Milwaukee area has simply the best frozen custard in the world. They say the vanilla is perfect; in fact, they call it a 'vanilla ecstasy experience.' But if your taste runs to something more elaborate, Kopp's has a flavor to satisfy. Jane's favorite is the French Silk Pie, a Swiss chocolate custard with cheesecake and chunks of chocolate in a pie crust. And if the frozen custard isn't enough of a dairy blow-out, order the classic Wisconsin buttered burger.