Serve these with Pancetta-Wrapped Pork Roast.
Bring water to a boil in a medium saucepan over medium-high heat. Add salt. Whisking constantly, add polenta in a slow steady stream. Continue to whisk until all of the lumps have disappeared. Reduce the heat to low, cover, and gently simmer for 5 minutes.
Stir in butter and pepper. Pour polenta into an 8-by-8-inch baking dish. Let cool on a rack until firm, about 30 minutes.
Using an offset spatula, gently pull the polenta away from the sides of the dish, and invert onto a clean work surface. Trim the edges of the polenta, and cut into quarters. Cut each quarter in half, forming triangles.
In a large nonstick skillet, heat oil over medium-high heat. Add polenta triangles, and cook until browned, about 5 minutes per side. You may keep the triangles warm in a 200 degrees oven for up to 30 minutes.