Peel the onions and remove the root.
Cut the onions from the center vertically, and slice the halves thinly in vertical cuts
Add sliced onions in a wide pot and add oil till it comes at the level of the onions. Eye ball the quantity.
Increase heat to high flame and fry the onions until golden brown.
Keep stirring the onions every 5 mins to check its getting cooked evenly.
Use a slotted stainless steel spoon to stir the onions.
The onions will release water over time and then will start to fry.
At about 20 min mark your onions will start to look very slightly brown. Reduce the flame to medium at this point and don't leave the onions un-attended anymore.
Stir constantly to make sure all the onions turn evenly golden.
When the onions turn light gold, reduce the flame to low and start removing the onions from the oil slowly.
Spread the onions on a tray covered with paper towel. And try not to crowd them.
Allow the onions to cool down and you will have crispy golden onions.
Use directly in recipes or make a pack in save it in the freezer.