For preparing Pacha Thakkali Ulli Thoran, finely chop the tomatoes, green chillies and small onions.
Mix together the above with grated coconut, turmeric powder and salt.
Heat oil in a pan or a kadai.
Splutter mustard seeds and saute dry red chillies and curry leaves.
Add the tomato-coconut mixture and mix well.
Cover and cook on a low flame.
When it gets cooked, remove the lid and continue to cook, till done.
Pacha Thakkali Ulli Thoran is ready.