Peel the carrots, and cut them into 7cm/3" pieces, not too thin (about finger size, you can say).
Boil the water and add the carrots to it.
When the water comes to a boil again, shut off the heat and leave to cool.
Add the salt and the mustard powder, and transfer into a jar with a lid, and keep this in the sun, to mature.
In sunny weather, it takes 3-4 days, for the taste of the mustard to become strong.
Do not keep the jar in the sun, after it is ready.
Key Ingredients: carrot, mustard seeds, salt