These are quick pickles and not meant to be kept a long time. If you want to can them, check out the
USDA complete guide to home canning. I'd say it's best to eat them within a few months, as they'll fade the longer they're kept.
You can vary the recipe by using rice vinegar or white wine vinegar, although I wouldn't use anything too fancy because the spices and other flavors will overpower it. The chile adds a bit of heat but you can skip it if you want to.
Serving: These pickles are very good with charcuterie (smoked or cured meats), or pâté, as shown in the post. They can also be slivered and used as part of a rice bowl, on sandwiches, or anywhere else you'd serve pickles.