I’ve been making onion syrup for my kids for years- just onion slices layered in a glass jar with sugar till all the juices macerate out. It’s amazing for breaking up phlegm in the chest and helping kids cough it out.
I’m trying a more common (and older) approach today and warming the onions on the stove in honey. I know raw honey should be better, but I don’t buy unpasteurized foods. I’ve included rosemary sprigs in the pot- rosemary is listed as being an antibacterial and a decongestant, besides being delicious. (Among many, many other properties.)
This will be great to have on hand for the cold and flu season- the toddler and preschooler have coughs that won’t break up, and onion boosts the immune system so hopefully this will help keep the rest of us healthy! I’ll either mix a spoonful into warm water or just let them lick it off a spoon.

This is great. My son has had a cough for weeks. Now if I can just get him to take it.
It’s pretty sweet, hopefully that will help! Good luck
My kids are the same way (especially one in particular…oh boy!)
Any specific ratios? And how do you preserve this? Does it keep in the fridge or cupboard?
Erin- No specific ratios. Slice an onion, and cover thinly with honey and heat gently. I threw in 3 sprigs of rosemary. The onions let out quite a bit of liquid, so my ending syrup was very thin. You could cook it longer to make it thicker, but I find a thin syrup is easier to give to the kids because it goes down their throats faster! You treat it like a jam as far as preserving goes- it has a lot of sugar, it’s pretty well preserved. Fridge is best, but it would keep in the cupboard (for a shorter time.)