Can I use unsweetened baking cocoa raw, or do products with it in it need to be cooked?
If we are talking about something like Hershey's (the brand I know) unsweetened cocoa powder (the dark reddish-brown very fine powder), it can be mixed with cold milk if you make a paste of it first, and then dilute it to the consistency you want. I.e. start with the powder, pour in the milk bit by bit stirring and "mashing" as you go so as not to let any of the powder float on the milk. This cocoa powder also mixes easily with oil &amp; fat, so that property should help with your ice cream ingredients which probably have some butterfat included.

If your recipe includes only ingredients and no instructions, perhaps that paste technique can help.