Please make your own polenta, it is SO much better than that premade roll-type thing at the store.
Ten Minute Polenta & Polenta Loaf
6 cups water (or water + broth, etc.)
2 tsps salt
1 1/4 cup Polenta, aka "Corn Grits" (I use Bob's Red Mill)
Bring the water to a boil in a high-ish sided pot (just don't use a shallow one! polenta "spits" a bit when simmering and it can shoot out of the pot!). I use the bottom of my stainless steel steamer :-).
Add salt if you aren't using broth.
Add polenta in a slow stream, whisking as you go. Let simmer about 10-12 minutes, whisking about every minute or so (it doesn't have to be constant whisking, but you do need to keep it moving). That's it!
You can put add-ins at the end, like garlic, herbs, cheese, etc.
Use immediately for a spoonable, soft polenta (it will firm up right in the dish, so beware!) or pour into a non-stick or lightly oiled or buttered loaf pan and let cool to room temp on your counter. I love this non-stick 10 inch loaf pan from Norpro. Once cool, cover and refrigerate for many amazing uses, like Polenta Lasagna!
That's it! You can always make polenta ahead. It keeps a while in the fridge.