Most food you can eat is now in finger foods:
Dairy: Cheese sticks.
Desserts: Cinnamon sticks, doghnut holes.
Grains: Breadsticks, hush puppies.
Poultry: Chicken-on-a-stick, popcorn chicken.
Seafood: Popcorn shrimp.
Veggies: Carrot sticks, celery sticks, fried veggiesticks,
french fries.
I could go on, but I won't.
So, build a buffet-style restauraunt based around these. You have cups wit bar codes on them, and dispensers like ice-cream or soda dispensers: push in the cup, trip the lever, fill it up with your food of choice.
A 'finger-food buffet' would charge four to eight dollars for a cup (plastic and rewashable, like trays are now). While you're socializing and what-not, you just walk up to the stand and refill as needed.
Less wasted food. Less utensils. Less work for the workers (or, they would work more on cleaning the store / helping the customers, which I would like).