Roast bell peppers on grill, or on a grill pan, preheated on high. Arrange whole peppers on grill and cook until the skin is charred, about 5 minutes per side. Place peppers in a paper bag. This allows the skin to be removed easily. Allow to cool in bag for about 20 minutes. Pull or scrape the skin off with your fingers or a paring knife. Cut off the stem end, cut open the peppers and scrape out seeds and membrane. Cut into strips about 1 inch wide.