If using a jarred red bell pepper, blot it dry and cut it lengthwise into 1/8-inch strips. If using a fresh red bell pepper, place the pepper over the grates of a gas burner, turn on the heat to medium, and cook until completely charred on the bottom side, about 4 minutes. Carefully turn the pepper with kitchen tongs to char the other sides. Place the pepper into a bowl, cover tightly, and set aside for at least 10 minutes.
