To make sauce,take a bowl.Add 2 tbsp tomato ketchup, red chilli flakes and chopped garlic.Mix all three well keep aside.In a pan Heat 2 tsp oil,add vertically sliced green chilli,Saute for a while.Add 1 tbsp white sesame seeds.Saute for 1 min.Add chopped onion and tomato.Keep stirring till onion and tomato become soft.