Very much still in copyright.
Oh and on the subject of Mexican food, what you get in Mexico City is very different than what you would get in say Cabo.
As to celebrities and restaurants, Sammy Hagar (rock star) owns a couple of different restaurants. The catch is he hired local chefs to run them and come up with authentic menus to the region. Yes, he put out a cookbook and every recipe is credited to the person that created it.
And in Texas, the Tex-mex varies by region.
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