My Babcias (grandma) winter syrup
My babcia had to chase me around the house, when I was a kid, with a spoon of this stuff, but once I got it, I felt better really fast.
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It usually takes 1 to 2 days for the syrup to form so prepare a little more. Once the syrup forms you may store it shortly but since it is onion I wouldn't recommend to store it for more than a week.