What is the one Restaurant City upgrade you always prioritize first?

I’ve been thinking about how differently people approach their restaurants. Some players seem to focus on expanding the layout as quickly as possible, while others put more effort into decorations, seating, or improving the overall setup.

I’m curious what everyone considers the most useful upgrade early on. Is there something you always prioritize because it makes the rest of the game easier or more enjoyable?

I’d be interested to hear how other players usually build up their restaurant.