Cuisine in Mexico is very regional...
so what they eat in one area they dont in another...
there is a massive variety a lot of it depending what indigenous group is in the area....
a lot of it is actually a fusion

So there are Aztec influenced food and Mayan

really tasty is chochinita pibil...and at halloween/day of the dead they eat Mumbi Pollo in the Yucatan
Also in the Yucatan they eat Poc Chuc

In Oaxaca...well its the centre of mole which is the most delicious food ever invented.
I miss tamales