In a pot,add cooking oil,cumin seeds & mix well.
Add onion,mix well & fry until light golden.
Add tomatoes & mix well.
Add ginger garlic paste,salt,red chilli crushed,coriander seeds,red chilli powder,turmeric powder, green chilli,mix well & cook for 1-2 minutes.
Add water & mix well,cover & cook on medium flame for 3-4 minutes then cook on high flame until oil separates.
Add potatoes,fresh fenugreek leaves & mix well,cover & cook on low flame until potatoes are tender (18-20 minutes),stir in between & cook until oil separates.
Add garam masala powder,Lemon juice,cover & simmer on low flame for 2-3 minutes.
Garnish with green chilli & serve!