Tomato – Onion – Potato  Fry  A tasty side dish (without gravy) with rotis / rice / lemon rice / sambar rice / dosa or a spicy filling for masala dosa. Serves: 3 Ingredients 1 tablespoon oil 1 teaspoon mustard seeds 1/2 teaspoon urad dal 1 onion, finely sliced 2 tomatoes, finely sliced 1 spring curry leaves or 6 nos 1/2 teaspoon