In China we had watermelon with every meal. Sometimes it came at the start, in the form of a fresh puree. I could drink gallons of this. Just fresh watermelon, blended and nothing else. It was always served at room temperature.
Anytime I asked for the puree cold or iced, I was told that it was just not done that way. And that watermelon is best enjoyed at it’s “natural” temperature.
No dessert, this was dessert. These watermelons were sweeter than anything I’ve enjoyed in the US. And it wasn’t limited to restaurants, – upon check-in at any hotel we visited, there was fresh watermelon waiting in the hotel rooms.