Would anybody like to share their favorite mexican dish?

Every year for Christmas Eve, my extended family will get together for a covered dish type dinner. Each year there is a theme. This year it’s Mexican food. I know I could google this, but I like the small touches that people add to the dish.

I would really like to be as authintic as possible, but it’s not a deal breaker. This can also be any meal. Desserts would be a nice touch, too.