Red or white onion juice, coconut oil, honey and lemon are a better syrup for a cough.
i tried this recipe from a friend's mom and it worked wonders. Peel Red Onions and make thick slices (may be say 3 or 4). Keep the slice in a bowl and put 1 tbsp sugar, then put another slice and again put 1 tbsp sugar, repeat the process until all slices are covered with sugar. Do this in the night and keep it until morning. In the morning there will be some juice in the bowl. Squeeze the onion with your hands to extract some more juice and drink it. Do it for 3 days. i got relief immediately after the first try.
Slice up a brown or yellow onion and place it in a breathable bag such as a linen bag. Put it is bed near the face of the sufferer and it will stop the coughing within minutes. If the sufferer is awake, tie the bag around the neck and lie down on the couch with eyes closed. I thank God for the wonderful herbs He gives us to help our sicknesses!
peel one large onion and cut in in half, put a half a tablespoon of brown sugar on to each half of the onion, and cover it, let it stand for an hour. The syrup relish should be taken at least twice a day. It works wonders.
I have stumbled across a remedy for coughs and bronchitis. slice an onion and place in bowl layer with pure honey, leave sit for an hour or so, this will yield a syrup. Have a teaspoon every 15 minutes until coughing chest soreness subsides.