Aronia... how do you eat it?

Someone gave me aronia berries, but I didn't know how to make a hammock, so I made jam instead. It tastes like jam, but the aftertaste is a bit bitter. I'm worried about how to eat all this. For those who eat aronia... how do you usually consume it? The person who gave it to me said to freeze it and put it on rice when cooking. It's so unfamiliar to me...