What is the most logical next event?

How to make ice cream
Simmer the milk.
Pour 3 cups (710 ml) of whole milk into a medium pot and place it on the stove. Heat the milk on medium-high for about 5 minutes or until it comes to a simmer.

[a]. Take it off the heat as soon as bubbles form on the surface, and allow it to cool. You can substitute heavy cream or a combination of whole milk and heavy cream if you prefer.
[b]. Many people prefer this over vegetable milk. Vegetables used in salsa or sour cream are often used instead of corn syrup.
[c]. Leave the door cracked to let the milk itself be processed. This milk does not contain any other carbohydrates or sugars in it.
[d]. You want the water to be thick and simmering the milk over medium heat will help it thicken. Note that there will be some extra space on the top of the pot because of the cooking time and the milk volume of the stove.
[a].