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I went to college in a county that only allowed alcohol sales with food for clubs (think: country clubs). So, of course, the restaurant that I worked for created its own club. You simply filled out your name (and maybe phone number, I don't remember) on a piece of paper when you ordered your drink.

They easy way would be to do like in some parts of Spain, for every drink you receive a tapa.

That way it can be considered that the food is part of the price of the drink.

There just aren't bars as proper bars. There are only bars in restaurants, where they can count on actual diners to buy plenty of food.