Add 2 teaspoons of salt. Gradually whisk in the cornmeal.
Reduce the heat to low and cook until the mixture thickens and the cornmeal is tender, stirring constantly, about 10 minutes. Turn off the heat.
Add the butter, and stir until melted.
Fried Polenta
Cut the polenta into thin long pieces.
Heat the oil in a heavy large skillet over medium-high heat.
Working in batches, fry the polenta pieces until golden brown on all sides, about 3 minutes per side. Using tongs, transfer the polenta pieces to paper towels and drain.Serve warm along with some store bought marinara.