I like this. Your model has a long history - the no-choice "prix fixe" dinner at the neighbourhood eatery in many European cities. The delivery option seems a neat way to transport it to the (generally) non-walkable US environment - I suspect you will have even better luck in other urban markets.
Consider offering a discount for 4+ portions per order. There are a lot of families who have a "delivery" night to ease the planning/cooking/washing-up burden and would also subscribe to something like this, instead of resorting to pizza. No need to pitch the whole thing around lone office workers, even if that is the obvious market. In general families are pickier about what they eat, and would more strongly care about getting something better than a microwave meal as convenience food.
Consider offering a discount for 4+ portions per order. There are a lot of families who have a "delivery" night to ease the planning/cooking/washing-up burden and would also subscribe to something like this, instead of resorting to pizza. No need to pitch the whole thing around lone office workers, even if that is the obvious market. In general families are pickier about what they eat, and would more strongly care about getting something better than a microwave meal as convenience food.