To check the temperature of oil, drop a small portion of dough into the oil, it should come floating up slowly. If it comes up fast & sizzles, the oil is too hot.If the dough sits at the the bottom, the oil is cold.
Gently slide 4-6 jamuns in the hot oil. Dont overcrowd the pan else the temperature wont be maintained.
Dont use any spoon until the jamuns come floating up. If you touch them before this point, they will break.
At first, these will look like gulab jamuns, however keep on frying and gently moving around till the jamuns are a dark color. They will plump up bit. Fry them for on all sides.
If you have enough oil, you can keep adding 2-3 more jamuns while the previous batch attains dark color. This will help in quickly finishing the frying process. However use your judgement, the oil temperature should not drop.
Using a slotted spoon, pick the fried kala jamuns and drain on a paper towel for few seconds.Dont let cool down.
Immediately add to hot sugar syrup.
Frying up all the jamuns in batches and add to syrup.
Cover and let soak in syrup for at least 30 minutes. These need a longer soaking time than gulab jamuns due to harder skin.
Once soaked, decorate with edible gold or dried rose petals. You can take them out of the syrup and serve dry as well. Enjoy warm or serve chilled.