But how do you make a roast beef sandwich at home that tastes like it came straight from the deli? Tasting Table spoke with an expert — Ron Didner, the owner of Mookie's NY Deli — to find out.

I ordered a roast-beef sandwich from Subway, Jimmy John's, and Jersey Mike's to see which popular chain does the classic sub best. None wowed me.

At Subway, I tried the chain's four new Deli Heroes sandwiches, including The Beast. The 6-inch sub is stacked with pepperoni, salami, turkey, ham, roast beef, and double provolone cheese.