A tomato juice and dried clam broth cocktail, Kermato is a Clamato knockoff produced by Nestlé México for sale in Mexico. Clamato -- produced by Motts -- is also processed and bottled in Mexico. Nonetheless, Kermato is more available than Clamato in Mexico; it is also less expensive and doesn't taste as good. Restaurants and bars in Mexico will freely substitute Kermato for Clamato without first consulting with the patron as to whether or not this substitution is acceptable.
I ordered a Pacifico with Clamato and the waiter brought me a Corona with Kermato instead.