(TrendHunter.com) Jersey Mike's added the ‘Grilled Portabella Mushroom and Swiss' submarine sandwich to its menu as a new permanent offering. The item was originally released in early 2021 as a... (TrendHunter.com) Jersey Mike's added the ‘Grilled Portabella Mushroom and Swiss' submarine sandwich to its menu as a new permanent offering. The item was originally released in early 2021 as a...