Is it possible to make homemade mascarpone? I had a piece of tiramisu that had a layer of mascarpone that really balanced the other flavors out perfectly.  At the grocery store it's sold in such little/expensive containers I was looking for an alternative homemade version - any ideas?
Yes, you can. You'll require heavy cream, an acid (vinegar or tartaric acid), au bain marie technique and patience and a refridgerator.

Check out preparation here.