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Boiling denatures some of the proteins, and gives you more of the texture you expect. From what I understand, if you don't boil it the texture will be very runny.

ELI5 - Boiling makes it easier for the bacteria to eat.

Also evaporates some of the water.

Using whole milk (also works fine with regular milk), refrigerated, so probably not UHT.

You should boil the milk anyways, you want all other bacteria/bugs dead and only the "wanted" bacteria to "spoil" the milk. Otherwise the result could be unpredictable.

Boiling the milk also helps the bacteria to work faster.

> You should boil the milk anyways, you want all other bacteria/bugs dead and only the "wanted" bacteria to "spoil" the milk.

UHT milk tends to be sterile, if it's straight from an unopened carton.