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I dice them and freeze them. not good for fresh recipes, but works well when browning beef for tacos or making chili. I did stuff and bread some of them and freeze them to make my own jalapeno poppers. They turned out a little soggy.
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I've always had the same mushiness problem with both frozen and canned jalapenos. This summer I did a few quick experiments, and had the best luck by freezing whole, unblanched peppers. They still weren't as crisp and firm as fresh peppers, but they were passable.
In order of crispiness, here are my results:
1. unblanched, whole, frozen
2. unblanched, sliced, frozen
3. blanched, whole, frozen
4. blanched, sliced, frozen
5. pickled, water-bath canned
I've also done pressure-canned jalapenos (not brined/pickled) in the past, but those were the mushyest of all.