Rinse the large green chillies well and pat them dry. Keep aside.
Sieve besan and rice flour. Transfer them into a mixing bowl. Add salt, turmeric, red chilli powder, ajwain, hing and cooking soda. Mix well.
Slowly add water and blend into a thick batter. Keep aside.
Heat oil for deep-frying in a wide kadai.
Hold the green chilies by the stem and dip them in the batter. Ensure they are evenly coated.
Gently place the batter-coated mirchis in the hot oil and fry over medium heat.
Once the underside of the chillies turns a golden brown, gently flip them over and fry on the other side. Keep turning them over a couple of times till the mirchi bajjis are uniformly browned.
Remove the crisp and golden brown mirapakaya bajjis with a slotted spoon and place them over paper towels to absorb the excess oil.
Repeat the same steps with the remaining bajjis. Keep aside.
Drop raw peanuts into the same oil and fry to a golden brown. Remove and keep aside.
Finely chop the green chilli, onion and coriander leaves. Place them in a small bowl and put in the fried peanuts. Season with salt. Add a little lemon juice and mix all the stuffing ingredients well.
Now slit each fried green chilli vertically and place a little stuffing into each of them.
Serve crispy Andhra Mirapakaya Bajji stuffed with peanut masala with a piping hot cup of tea.