Rohu Fish in the Cauliflower Curry

Name: Rohu Fish in the Cauliflower Curry
Ingredients: 500 gms Rohu Fish (Cut into steaks, Washed & Cleaned- Marinated with some salt & turmeric powder for about 15-20 mins time before frying); to taste Salt; 1 tsp Sugar; 250 gms Cauliflower Cut into big or medium florets; 250 gms Baby Potatoes Cut into medium-big chunks; 1-2 Tomatoes Chopped; 1 tsp Red Chilli Powder; 1/2 tsp Turmeric Powder; 1 tsp Roasted Cumin Seeds Powder; 1 tsp Coriander Powder; 1 tsp Cumin Seeds (Whole); 1 Dry Red Chilli; 1 Bay Leaf Optional; as needed oil