The best cheapest way of making people full

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What is the best cheapest way of making people full?

Carbohydrate+ Oil.

What is the easiest grown carbohydrate that comes in large quantities?
Potatoes

What is the best cheapest oil?
Olive oil

What is the best way of cooking potatoes with olive oil?
I heard if potatoes are fried, they turn into sugar.

=Roast Potatoes

Roast Potatoes are the best way to make people full.
But don’t forget another layer of possibility, carbonated drink.

What is the best cheapest carbonated drink?
Carbonated water

I want to run a stall on the street to provide people with roast potatoes and carbonated water for free. Just to make as many people full as possible.