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Grilled Cheese Grill, the Classic Portland Food Cart Run Out of a Converted School Bus, Has Permanently Closed Owner Matt Breslow planned to reopen the flagship cart in 2021 before learning the lot he’s been parked on for 12 years had been sold to a developer. IMAGE: Visitor7/Wiki Commons. One of the standouts of the initial Portland food cart boom has closed for good. Grilled Cheese Grill, the cart specializing in creative, cheffed-up versions of the children s lunch classic, will not be reopening, owner Matt Breslow announced on social media yesterday.