Polenta Squares with Prosciutto

Preparation

1. Step 1

   Bring 7 cups water to a boil in a large saucepan; add 4 teaspoons salt. Whisking constantly, add the cornmeal, a little at a time. Reduce the heat to medium-low; cook, stirring frequently with a wooden spoon, until the polenta pulls away from the sides of the pan and is very thick, about 25 minutes.

   Step 2

   Heat the oil in a medium skillet over medium-low heat until hot but not smoking. Add the prosciutto and garlic. Cook, stirring, until the prosciutto is slightly crisp, about 5 minutes; stir into the polenta. Season with salt and pepper, if desired.

   Step 3

   Pour the polenta mixture into a 9 × 13-inch baking pan; smooth with a dampened spatula. Let cool at least 1 hour.

   Step 4

   If not serving the polenta immediately, cover it with plastic wrap, and refrigerate until ready to use (or overnight).

   Step 5

   Trim 1/4 inch from all sides of the polenta. Cut into 48 squares. Preheat the broiler with the rack 5 inches from the heat. Lightly brush a metal baking pan with oil; heat under the broiler 30 seconds. In batches, broil the squares in the pan, 2 minutes. Place a cheese cube on each square; season with pepper. Broil until the cheese is melted, about 1 1/2 minutes. Garnish with marjoram sprigs.