To prepare teas:

Bring water to a rolling boil. Then add the preferrred spices and keep the lid on for a few seconds. Add melted jaggery. You can add other ingredients like lac for colour and flavour.

Jeeraka vellam (Cumin Tea)

Ingredients:

200ml water
Generous pinch cumin seeds
1 spoon melted jaggery

Inchi vellam (Ginger Tea)

Ingredients:

200ml water 
Piece of ginger the size of one third of your index finger
1 cardamom pod (pound cardamom and ginger together)
1 tablespoon melted jaggery 

You can add milk to this tea. However, wait for a few moments before you add the milk, since hot jaggery might make the milk curdle.

Malli vellam (Coriander Tea)

Ingredients:

200 ml water
½ spoon coriander
1 spoon melted jaggery