I prepared the Gulab jamuns few days back. Now there is a lot of sugar syrup remaining, what's the way of preserving it without using the fridge?
One way is to boil it daily, but that'll consume a lot of gas. So, any other way out?
Sugar is a natural preservative and provided you store it in a dark, dry, cool place it should keep for a long time. You should store it in a sterilised glass jar or bottle.
To sterilise, place the empty, open jar in a pan of cold water and bring to the boil, boiling for ten minutes. Remove, pour in the syrup, then place the lid on and return to the boiling water for another ten minutes. Dry with a clean towel and store.
You can can/bottle it. google for some good canning/bottling instructions. You can then use the jars at your leisure. They should store for a long time in your cupboard.