I think the vinegar thing with spinach, came about because we are not going to run to the store in the dead of winter to get a lemon, but how many of us run out of vinegar? Spinach with butter and vinegar...Yummers. My mom and mother in law both use to use canned spinach when they made their home made raviolis, saved them an hour in the putting together process that way...Before I go to all the trouble could you please send me your investment portfolio and your tax returns for the past 7 years?
The vinegar on spinach is a very common thing - also for collard greens. I don't know if it's a midwest thing or a southern thing or simply a "spinach thing" And to top it off a lot of people will toss in a few sliced hot chili peppers OR you can buy vinegar with whole chili peppers in them and use that.
kadesma