Also, I've never in my life heard of American chop suey! Is it a New England thing?
They served this for school lunches in my school in Mass, though from my recollection it was just bolognese with elbow macaroni (probably using the day before's leftover bolognese sauce). Not a vegetable in sight if you don't count the sauce. And man, was it salty.
A good chopped salad wouldn't go amiss. And if it's an American restaurant, you can't not put a few fancy burgers on the menu. Can I recommend using Hawaiian sweet buns? Yum!
Re brunch - it's fairly prolific now in London (another recommendation: Kentish Canteen!). But if you are going to do it, put a short stack of pancakes in the menu. What I wouldn't do to have an american style pancake every once in a while. And a good, old fashioned American breakfast: 2 eggs any style, (streaky) bacon, toast and home fries. Oh, and a bloody mary bar.