Any trip to Waukesha should include a trip to Jimmy's Grotto. Whether you choose the Ponzaratta or the Italian Sausage you will have a winner. A large group, call ahead and place a carry out order or ask for delivery. The pizza is good and the poppers and pepper rings are favorites,too.
Picky eaters in your group, order the grilled chicken.
Jimmy's Grotto - yum
PS - remember to get cash, no credit cards.