First, Heat oil and splutter mustard seeds, fennel seeds, and curry leaves
Add onion, small onion, and curry leaves; mix well
Furthermore, add turmeric powder and salt; saute well
Add tomatoes; saute well
Furthermore, add drumsticks; saute for a minute
Add sambar powder; mix well
Furthermore, add water; close and cook till the drumstick cooks well
Open and cook till the thokku comes together