Roasting your own red bell peppers is completely easy and well worth the added flavor from what you can get in a jar.
Roasted Red Bell Peppers
Rinse bell peppers.
Place under broiler, on grill, or over an open flame until skin begins to blacken and blister.
Turn peppers occasionally to blacken all sides.
Place hot peppers in a glass bowl and cover with seran wrap (you can also put them in a brown paper bag and fold down the opening).
Let sit for 10 minutes.
Remove peppers and cut in half.
Remove seeds, ribs and stem.
Peel off skin (should come away easily).