Mascarpone cheese is great, but can be hard to find. Here's a simple recipe that you can use at home to make mascarpone. It isn't 100 percent authentic (authentic recipes use a bacterial culture), but it doesn't require any hard to find ingredients, either!
You may substitute 3 tablespoons of lemon juice for 1/2 teaspoon of cream of tartar. Using lemon juice will impart a lemony flavor.