Put heavy cream, milk, and vanilla syrup into a French press.
Place the lid and move the plunger up and down 40 times.The cold foam will increase in volume. Pour cold foam on top of an iced drink and serve immediately.
Any iced drink that tastes great with milk will be delicious when it's topped off with vanilla sweet cream cold foam.
A shortcut to making vanilla sweet cream cold foam is using half & half. Replace the heavy cream and milk with ⅓ cup of half & half.
Get Starbucks vanilla syrup at any Starbucks location by asking if they have any available for purchase. If they have extra in stock, they'll sell it to you for about $14.
A handheld milk frother can also be used to make cold foam but the French press does a better job of creating smooth, even froth.
Don't overfill the French press. Since the cream will double or triple in volume as air is pumped in, only fill the French press halfway with cream.
Make sure the French press filter is fully submerged in the cream so that air can be pumped in.
Any leftover cold foam can be stored in the fridge for 2 days. It's best to make it and serve immediately.