Matron of Husbandry over at the simple green frugal co-op posted some instructions a few days ago for making your own ricotta. It looked ridiculously easy- except for the milking your cow bit - I cheated and bought some from the store! - so with lasagne on the dinner menu last night I decided to give it a go.
I won't post the details here as the instructions in the link above are excellent. But here's a few photos to prove that it works! For those that are interested 2L of milk yielded 325g of ricotta. I used apple cider vinegar, and it required about 3 tablespoons (60ml) to get separation.