So CONDENSED MILK
You will need
1440ml of lactofree milk (or oat milk or whatever milk you drink)
200g of sugar
a tablespoon of vanilla essence
That is a lot of milk, but you have to boil it down so if you're measuring it out and you're like, woah! milk overload don't panic. If you're not dairy free, you can just buy your own condensed milk in a tin from the supermarket and save all this effort of course!
Put your milk and sugar in a pan, and bring to the boil stirring constantly.
Keep stirring and boiling the milk, it will gradually boil down to about 400ml of "condensed milk". This might take quite a long time, it took me about 45 minutes!
Don't forget to keep stirring to avoid burning.
Once the milk measures about 400ml, you can add the vanilla flavouring and it's ready for the next stage.
Then I believe this can be kept in the fridge like any normal food for 3 days, and used as condensed milk in any recipe :>