Making ice cream and fats don't dissolve in base I am making ice cream from this recipe:
http://www.seriouseats.com/recipes/2010/10/apple-browned-butter-sour-cream-ice-cream-recipe.html (the first variation)
Upon reaching the final mixing step for the base, I find that small clumps of something (I assume fat) are not dissolving at all in the mixture (I've stirred for 10+ minutes with no effect (I don't have a blender)). The recipe warns that I need to completely dissolve the "butterfat" in the emulsion, otherwise the ice cream will be "grainy."
What has happened, and how do I fix it? Preferably without buying exotic ingredients I won't use in the future.

I have deviated from the recipe in these ways:


I have no strainer, so I did not brown the butter as much as is called for and then just let gravity work to strain out the brown particles. I wasn't exactly sure how much to let the butter cool before adding it -- I let it sit for at least 10 minutes before adding it, but it was still molten when I did add it. Within 8 minutes or so the stuff I hadn't added had solified, so it wasn't that hot. 
I have pre-made, refrigerated apple cider syrup, so I used that instead of the boiling apple cider. The nutmeg really did not dissolve at all in the syrup even after stirring, but I figured it would do so once I added the syrup-nutmeg mixture to the other ingredients.


Thanks for any help you can provide.

Update: I took Russell's advice and heated the mixture up while stirring. That worked to dissolve all the solids!
Update 2: Recipe finally turned out as expected: interesting, not-very-sweet ice cream. Thanks everyone!
Looking at the ingredients in step 3, my guess is that the sour cream is causing the milk to curdle, possibly made worse by the heat from the melted butter.

You might try experimenting with first mixing everything except the sour cream together, then letting it cool completely, and then slowly whisking in the sour cream.

You might also try slowly heating the lumpy mix you already have, and see if whisking it over a low heat helps it to dissolve.

Good luck.