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On Sunday, mobile restaurateur Matt Maroni cedes his kitchen to Lockwood‘s Phillip Foss, another chef who dreams of food trucks. For one day only, Foss and his wife, Kenni, will use Maroni’s north-side Gaztro-Wagon storefront (5973 N. Clark) to test several concepts from their newly formed Foss Family Food Trucks. Homemade doughnuts are for sale from 8 AM on, and a brunch menu served from 10 AM to 2 PM includes the “golden brick”—an “oozing egg in crispy brick pastry”—as well as brioche French toast and a tomato-and-cheese omelet. At 2 PM the Fosses switch to their “Meatyballs Mobile” concept: until 8 PM, the menu consists strictly of meatball sliders and cheese sauce on puffy pan bread. The full menu’s available here, though Foss warns that it’s subject to change.