Really no commercial sub that isn't high in salt. You could make your own stock and really reduce it to a syrup consistency then freeze it in ice cube trays. But the Better than Bouillon pastes are good, still high in salt though.
Any living relatives you could ask for recipes? I have been getting my mom's and putting them into a family cookbook. Every family member gets a section divided into breakfast,lunch, supper, snacks, deserts. At 300 pages now and counting. I publish a digital edition for family embers every year with the updates and print out a copy for mom who is computer challenged at 79 years old.
I blanch, cut from the cob, and freeze my own corn in a vac bag with a pat of frozen butter(keeps it from ending up in the food saver). Take a bag out, drop in simmering water and nice hot as close to corn on the cob as you can get.
I think it is the lack of taste with zucchini, one of the most bland things I have ever eaten. Around here people end up trying to give them away, you don't leave your car unlocked or you might find a bag of them in your front seat