I'm undecided about #pickling.
It's not really a time saver, like sauces, and they can't be a staple because of the salt and sugar involved.
I like to keep red onion in the fridge, so I could take the next step and sterilise some jars.
I really like to do this recipe with zucchini https://www.justonecookbook.com/spicy-japanese-pickled-cucumbers/ and I know it tastes perfect and fresh after two days. I could do a 400ml jar at a time to keep in the fridge.
And I might try to do a batch of bread-and-butter pickles just to learn the technique. I'd like something mild and not too salty.