One usually associates cassatta with Palermo. In fact, it's usually called cassatta Siciliana.
There's a fairly easy cheesecake made with ricotta called "crostata di ricotta." Decorate the top with pine nuts, and a lattice crust cut with a ripple wheel, and it will look rustic as all h*ll. These were a favorite with my customers when I catered.
I'm attaching a link to a recipe that is almost identical to the one I used (which I got from the Time-Life series -- back in the day). The only functional difference is that I used a liqueur called Strega for the crust, rather than marsala. Use more or less anything, it won't make much difference. Tip: You'll get a better crust (pasta frolio) with lard than any other shortening. One last thing, you want rustic? Serve it with grapes.
astray recipes: Cheese pie {crostata di ricotta}
Another simple favorite is zabaione, which originated in Piemonte.
Bravo,
BDL
ON EDIT: I'd only scanned the recipe before I linked it. Now that I've read it more carefully, I'm pretty sure it was plagiarized from Time-Life. Excellent, if unethical.