Translation:At this restaurant, I got liquid cheese.
I wouldn't expect to hear "liquid cheese" very often from a native speaker. But I can imagine someone using if the cheese is really something that is more drinkable than eatable. Since "melted" is accepted, I have added "runny" as well. For me (native AmE, East Coast), "runny" would be the most used adjective, say, if the cheese is sliding or dripping out of your burger... (But if "runny" really doesn't work from the Czech perspective, the edit may be retracted.)