Remove seeds and white part of capsicum and cut into medium size pieces.
Roast besan on low flame till it is aromatic and slightly changes its color. Keep it aside.
Now in a pan, add oil, hing, mustard seeds, cumin seeds and green chilli slits.
Add chopped capsicum and salt. Mix well and cook on high flame till capsicum become slightly soft.
Then add turmeric powder, red chilli powder, coriander powder and sugar. Mix well.
Add roasted besan gradually and mix well.
Sprinkle little water and cover and cook it for 3-4 minutes.
Then add garam masala and mix well.
Switch off the flame and add lemon juice to sabzi and mix well.
Serve simla mirch besan sabzi with roti or chapatti.