Take oil in a pan, add fennel and cumin seeds.
Add in onions, garlic, chillies and curry leaves. Saute till lightly golden. Add salt and mix well.
Take milk, water, sugar, yeast in a bowl and mix well. Leave to sit for 5 mins to activate.
Now add in all purpose flour and salt and mix well.
Add in the onion mix and knead to a soft dough.
Now cover and let it rest for 1 to 2 hours till doubled in size.
Punch the dough down and knead well.
Now take small portion of the dough and shape it into ball.
Arrange it in a baking pan, cover and let it rise for 30 mins.
During the last 10 mins or rising, PREHEAT OVEN TO 200 DEGREE C.
Mix all the ingredients for topping.
Brush all over the buns and bake for 12 to 18 mins.
Remove and serve.