I have frozen them right after picked and they came out ok for soups and sauces
but I reallly love to roast them in the oven, with onion cutup, garlic, salt and pepper,
then freeze them juices and all sooooooo much better. i hate canning, so i do this and and put them into canning jars and freeze them. just remember fill only 3/4 full - leave expansion room. they come out fine, i use them for sauce, salsas, soup.
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