My first pint only lasted about a week, so I made two quarts yesterday. I didn’t notice anything stringy. I’m pretty handy with a chef knife and sliced them super thin, like spaghetti noodle thin. Maybe that’s why? I have a mandolin, but that thing scares me. I don’t know that it would make a difference about the membrane, but I always slice onions pole to pole if I want the individual slivers to stay intact and across the grain if I don’t. They’re also less strong cutting pole to pole because you’re not cutting across as many cell walls releasing the sulfur inside.
Here’s my recipe…50/50 water and white vinegar, and 2T each of salt and sugar per quart of liquid. Microwave it just hot enough to easily dissolve the salt and sugar and pour it into containers packed with onion. I leave it on the counter until it’s cool, then lid up and into the fridge.
I used them on scrambled egg and bacon breakfast tacos this morning and a turkey sandwich for lunch.