For all those that mentioned potatoes, it triggered a memory of my Mexican born grandmother making these chunky hash browns with our breakfast tacos (you would put the hash browns in the taco). Never knew if that was “Tex” or the “Mex.”
Another thing I thought of was coleslaw. In Texas, a lot of people put that on or with their fish tacos or fried fish in Mexican restaurants. Don’t know what they do in Mexico.