business lunch on route 1/9 in Edison?
FYI- there is no "1/9" in Edison, the two highways split north of Edison in Woodbridge, so if you're searching for an address or location, it's simply "Rt. 1" (technically "US Highway Rt. 1" I suppose) after that. For non-chain eating, you're going to be better off looking for places on the parallel Rt. 27 (aka "Lincoln Highway") .
Right off of Rt. 1, past Edison is Fresco in Milltown. Very good BYOB, if you want to drink.
The only other place I could think of to have a business lunch is that Skylark Diner. As much as I think they place is average, I suppose if you can't find anything else, this place might work. It sells alcohol, too if you need a strong drink. ha ha!
It is right on Rt. 1 North in Edison