Boil Water: In a large pot, bring the water to a boil.

Cook Polenta: Slowly whisk in the polenta and reduce the heat to a simmer. Continue to stir until the polenta is thick and creamy.

Saute Mushrooms: In a saute pan, melt the butter and add in the chopped mushrooms. Cook until they are browned and tender.

Prepare Ragu: Add the tomato sauce, salt, and pepper into the pan with mushrooms. Stir well and let it simmer till it thickens.

Serve: Place the polenta on a plate, top with the mushroom ragu and serve hot.