I've actually made peperonata and, by bottling then "cooking" in a water bath for 25 minutes, achieved conservation for up to 6 months.You do need to make sure everything is squeaky clean and that the peperonata is completely covered with oil.
Yesterday, I saw some cannelli beans in the cupboard and decided to make a roasted red pepper and cannelli bean soup -which I did. It was gloriously good.
I cooked the beans first and roasted the red peppers with a couple of onions, salt, pepper and mixed fresh herbs (parsley, oregano, basil, sage, thyme and rosemary were available). Splashed and mixed with olive oil, Jamie style ( ie " whack all those beauties together in a bakin' tray, slosh a bit of Extra Virgin over the top, and just mix 'em up wiv yer ánds. Stick it in the oven for about firty five minutes. Bob's yer uncle!") then blended smooth. I added the bean water (from dried beans, not from a tin) and a little extra liquid. Brought to the boil then added the cooked beans and warmed the soup through. Adjusted seasoning (In fact, I added a tsp of Spanish Pimentón or Paprika, just because it was there) and served with crusty bread.
You could also make Sweet pepper chutney; it´s ok with all colours but far superior if you just use the red ones. Mine's as follows:
1.2 kgs Red Peppers, chopped
400 gms sugar
275 gms onion, chopped
200 ml white wine (or cider) vinegar
60 gms mild red chiles, deveined if you wish, but definitely deseeded for aesthetic reasons!
5 cloves garlic
1 tsp salt
1 tsp paprika or Spanish Pimentón Dulce
METHOD: ( VERY complicated.

)
Whack everything into a large pan and cook for about 25- 35 minutes, until the chutney is thickened. If there's too much liquid, just drain some off and give it to the cat.
Bottle, seal, cook in water bath for 25 mins. Store.

Then there's Louisiana pepper jelly. That is just magic.
Or you could go for a portion of m´hammara (sic?) - a delicious Middle Eastern mezze made with red peppers and hazelnuts.