In the episode "One of them", Hurley had a stash of food. Hurley was eating Ranch dressing with something ( I forgot ), he mentions how it taste good.
30 years back
In the episode "Some like it Hoth", when Miles is delivering the body to Dr. Chang, Hurley jumps into the car with Miles with a load of sandwiches and a special delicious sauce.
Now, could it be that Hurley created the Ranch dressing 30 years ago, and they used it as the DHARMA Ranch? that is why Hurley found it to be good 30 years later when he ate it.
What do you think?