Imagine instead of many different, individually packaged, products, you have one (or maybe a handful) of pre-packaged meals for one or two people. The retail space and checkout would be insanely efficient as you'd just grab and go.
You'd have the green angle too as there wouldn't be any excess packaging to keep the food fresh nor carbon emissions from all the individual deliveries. Just standard refrigerators and pictures of happy patrons walking home with their meal kits.
The recurring subscription model, i.e. the holy grail of high valuations, could be added as well. Either through the usual $X/period gets you Y meals or maybe just a discount ($Z/month to get Q% off).
Or taking it to the next level, imagine a meal kit vending machine. The owner would stock it each day (say around 3pm) and customers could grab their own meals with a quick swipe of their card. Same idea as the store but reducing the retail space from a mini store to a couple square feet.