It's Day One for Mac Mart (104 S. 18th St.), the storefront version of Marti Lieberman's popular, three-year-old food truck specializing in mac and cheese.
Mac Mart, in a former shoe-repair shop next to the new Cleavers cheesesteak shop and across the street from the Di Bruno Bros. Rittenhouse store, has a bright interior design and cafeteria-style ordering. There are a couple of seats in the window, but it's intended as a take-away.
Start with a base ($6.95) - the original seven-cheese mac topped with potato chip panko crunch - and customize from there.
The menu (check the photos) includes a wide array of "mix-ins" (mozzarella, diced tomatoes, roasted red peppers, caramelized onions, hot dog bites), "dollops" (spinach & artichoke dip, jalapeno popper dip, basil pecorino pesto, and jalapeno pesto), "drizzles" (such as BBQ, Buffalo Drizzle, Pam Pam's buttermilk ranch, ketchup, sriracha), and "crunches" (potato chip panko, cornbread, fried onions, and Old Bay potato chip panko).
Mac Mart's "classic" bowls include spinach and artichoke, a "Fat-n-Happy" (topped with bacon, fried onions & Pam Pam's buttermilk ranch), a "BBQ in a Bowl" (with barbecue chicken chunks, cornbread crunch and a BBQ drizzle), 'a Wit' Mac (topped with Philly steak, caramelized onions, potato chip panko crunch, and a ketchup drizzle), and a "Heart Attack," which comes with caramelized onions, bacon, potato chip panko crunch, and, presumably, a stent.