In a pan pour the condenseld milk and butter. When the butter is melted add the gelatin.

With a rubber spatula keep whisking constantly so it doesn't get stuck in the bottom of the pan. After 10 min or so it'll start to become thick, take off the heat and pour into a plate. Refrigerate until it's cold.

Rub a little butter in your hands so you can turn them into balls without it sticking in your hands.