Wash the Jalapeño peppers and slit them along with the stem. Keep them aside.
Heat oil in a Kadhai/Pan.
While the oil heats, prepare the batter.
In a mixing bowl, combine gram flour, rice flour, salt, turmeric powder, red chilli powder, and carom seeds. Mix with a whisk.
Add water and whisk it to make a smooth, lump-free batter. The batter should neither be too thin nor too thick. It should be like pancake/dosa batter.
Add baking soda and 1 tsp of oil and whisk again. Now the batter is ready.
Coat the chillies in the batter and, one by one, drop them in medium-hot oil.
Fry them till they turn golden brown.
Remove them on a tissue paper.
Sprinkle chaat masala on the bhajjis and serve them with chutney/ketchup.