I made this and it tasted really good. However, I had a few problems. First, the polenta really stuck to the pan when I was sauteeing it, even though I used a nonstick pan and oil. I'll try the suggestion about grilling rounds instead. Second, I think the 3/4 cup broth was a little too much -- the sauce ended up kind of watery. You don't need much liquicd at all to wilt spinach, so next time I'll use more like 1/4 cup. Finally, the vinegar tasted good but slightly overpowered the other flavors -- I think I'll cut back on that, too, next time.
Asha, Hmaden, CT