How do you make the raspberry jam stuff that's swirled into a raspberry cheesecake?

(Doesn't have to be raspberry, it was the first berry that popped into my head) You know how you see cheesecakes in the store and they have a berry mixture swirled around in it? That's what I want to know how to make. I can't find it on google because I don't know what that stuff is called LoL So... show more (Doesn't have to be raspberry, it was the first berry that popped into my head)
You know how you see cheesecakes in the store and they have a berry mixture swirled around in it? That's what I want to know how to make. I can't find it on google because I don't know what that stuff is called LoL
So either what's that stuff in the cheesecake called or if you know how to make it, please tell me?
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