Heat the oil on medium heat in a kadai for frying.
While the oil is getting hot, take one raw banana and peel it. Do not peel all at once, peel them as you go.
Using mandoline slicer, slice half of the banana or just enough for one batch frying in a plate.
Add one by one into the hot oil, add a teaspoon of salty water and fry till they are very light golden color and crispy.
Then remove it to a plate and sprinkle salt, pepper while they are still hot.
When the first batch is about to ready, slice next batch and keep it ready. So as soon as you remove the first batch from oil, add this sliced second batch.
Repeat the same for rest.
Method 2: Once the oil is hot enough for frying, Slice the banana directly into the oil. If you are first timer then be careful doing this.
While slicing you can lower the heat so your hands do not get hurt.
Now add a teaspoon of salty water.
Do turn them or move them for even frying. Once ready remove it to a paper towel lined plate and sprinkle salt, pepper.
Once cooled completely, they are ready to serve.
Notes
If making this for fast (vrat or upvas), then use rock salt instead of regular sugar.
For the variation, you can sprinkle red chili powder, chaat masala, amchur powder instead of black pepper powder.
It stays good for 2-3 weeks in airtight container.
If the weather is humid in your area or it may get soft, you can spread them on microwave safe plate and microwave it for 40-50 seconds. As it cools it will become crispy again.