I think culture has an enormous impact though.
Just like in London (esp. South London), jellied eels are, or at least used to be very popular and loved. Go even a few miles out and most people would gag at the prospect. I know I wouldn't touch them within an inch of my life.
Actually I think cultural conditioning can do the trick if it starts from an extremely young age.
Even the most rudimentary biological processes inside single cells are influenced by environmental factors - that doesn't mean those cellular processes are not encoded in your genes.
There is overwhelming evidence spanning decades of research from many different types of methodological approaches that demonstrate most behavioural traits e.g. introversion/extroversion, let alone something as basically biological as taste preferences, have strong genetic underpinnings.
There include twin studies where you look at identical twins (these guys share 100% of their DNA) and compare them to fraternal twins (they share 50% of their DNA, on average). It turns out that the identical twins are much more similar on virtually everything you can measure. You can also track down rare identical twins that were separated at birth and raised apart and guess what? Despite having a completely different upbringing, those identical twins grow up to have virtually identical favourite foods and identical disliked foods.
Adoption studies look at individuals adopted as infants and raised in adopted homes and compares them to both their adoptive parents and their biological parents (whom they often don't even interact with), and guess what? People are more similar to their biological parents in their food preferences than they are to the adoptive parents that cooked for them all their childhood and teenaged life.
These days we do studies that examine the genome. In GCTA studies you can take a population of completely unrelated individuals, for example the people that posted in this thread, and then examine how genetically similar we are before looking at how phenotypically similar we are. And guess what? The people in this thread who are more genetically similar will, on a statistical average, have closer taste preferences.
None of this means that culture is completely irrelevant. Think of the genetic aspect of a trait as a rubber band. The environment and culture can ONLY stretch that rubber band - it cannot magically change its type etc.
Yes, cultural conditioning can change our food preferences - but some people are genetically more prone to tolerating meat than others. And the idea that different populations that evolved in completely different climates with completely different diets will have identical genetically based food preferences is about as likely as the idea that peoples in different climates will evolve identical skin colour.