Polenta is basically a thick cornmeal mush (although culinary goddess, Marcella Hazan, calls this description an indelicate use of the English language), which is either served hot and creamy from the pot with a sauce of some type or shaped and left to cool, then later sliced and fried, baked, or grilled.
Is there anything finer in the world of vegetable cookery than a properly made Potato Gratin? Not in my book. However, there is a complicating factor that needs consideration. Potatoes are surprisingly acidic and have a definite tendency to curdle milk, half-and-half, and even, but to a lesser degree, heavy cream. What’s the cook to do?