Soak sliced raw banana in water to prevent discoloration.
Add turmeric and salt; microwave for 4 minutes until fork‑tender.
Drain completely in a colander.
Add cooked banana to a bowl with all marination ingredients; mix gently.
Refrigerate for 30 minutes.
Heat a cast‑iron or dosa pan with coconut oil.
Place marinated slices and roast until golden and crisp; flip and cook the other side.
Add curry leaves and continue roasting until fully crisp.
Serve hot with a variety rice.