Why was there pizza in Mass Effect?

Why was there pizza in Mass Effect?

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Had to make up for the lack of gameplay and coherent story.

Why wouldn't there be?

Not canon.

Why would everyone have the same customs and subcultures and cuisines? Why was there pizza in mass effect?

The could be hundreds of thousands of humans living on the citadel. Why wouldn't there be human dishes?

They also have sushi bars on the citadel.

It's one of the most popular foods in the world. No doubt it would survive to the late 22nd century and aliens would probably like it too.

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But wrex orders the pizza, not Shepard. Why would a Krogan eat pizza? This really took me out of the game

The Citadel has a population of 13 million of all races, usually huddled into districts. You think the local industry doesn't adapt and serve all kind of goods for the different populations including dishes from their homeplanets?