I have a recipe calling for "16 oz tube refrigerated cooked polenta".?

Tubes of polenta are sold either in the Pasta section or where rice is sold. The rice usually used for Risotto and that is not usually where regular rice is.

If you can not find it it is very easy to make your own polenta then once it is done pour it onto a piece of plastic wrap and roll it into a log shape. Refrigerate until it is firm. It will be firm as soon as it has cooled a bit.

This is what it looks like. https://www.google.com/search?q=polenta+tube&clien...

Trader Joe's has it. World Market has it. A lot of grocery stores have it - it is not necessarily refrigerated, though. Try the pasta aisle.

And, as others pointed out, it is quite easy to make. If the goal is rounds of polenta, then make it and spread it in a cookie sheet (or two) to the correct thickness and use a cookie cutter to cut rounds once it has firmed up.

I've seen polenta in tubes in supermarkets here in California. But I think it's kind of silly to buy it when it's so easy to make. Polenta is the Italian word for 'cornmeal mush'. You boil some water and pour cornmeal in slowly while stirring until it gets thick like oatmeal. That's polenta! I can't tell you how much water and how much cornmeal you need to make 16 oz, but it shouldn't be hard to figure out.

After you make it, you let it cool, then refrigerate it, and it gets hard. You can then cut slabs of it and fry them. An Italian restaurant we go to makes a dish with a salmon fillet on top of a slab of deep-fried polenta and it is DELICIOUS! Lots of things go good with polenta.

Polenta is what they call Grits down in Mexico. Nope, not joking. Both are cooked porridge made from ground up corn meal.

If you don't have a Mexican grocery store near you, just use 16 ounces of cooked grits. They don't have to be cold.