It's risky, no doubt. Especially in Mexico. But so is eating oysters. So is divingMossman - yes - you have a pointBut I do like my ground beef cooked - too many unknowns in there ! I do routinely have steak tartare and beef carpachio though - different cuts of meat - but the ground stuff I prefer medium to medium well!
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There is a way to eliminate the e. coli risk: grind your own beef. E. coli only inhabits the surface of beef, which is why steaks are safe cooked rare because the outside gets seared. Problem with ground beef is that all the surface bacteria gets blended in with the rest of the beef and then propagates if the beef is left at room temperature. "Fancy" restaurants, in the States at least, will grind their own beef using prime cuts, searing or trimming the outside so it's bacteria-free, then grill the burger to a perfect medium rare and charge $15 or so for the pleasure. Maybe someone like Le Chef will give that a try in Cozumel some day.
As for my burger reviews:
Cozumel Palace: Nothing special. Just a pre-made frozen hamburger patty. Only served at the pool restaurant or via room service. They always have self-serve guacamole out for people wanting chips and salsa, a dollop of that helps.
Occidental Grand - Royal Club Restaurant: Ate a burger there after almost every diving day on my last trip since the menu was rather limited. Burger meat tasted funny, was probably horse. But with cheese and condiments, lots of onion, it went down OK with red wine. Excellent fries, however.
On one of my first trips to the island, I stayed at the Fiesta Inn (now Hotel Cozumel) and their lunch was served by the pool. Burgers were just premade frozen patties, but they were cooked on a small grill and were very tasty. Besides breakfast, the burgers were the only edible food there.
I look forward to reporting on the Secrets burger in June.