Put the clove, bay leaf, coriander seeds and cinnamon in a muslin and close with kitchen twine forming a bundle.

Put the bundle and all the remaining ingredients in a saucepan and bringto a boil.

Once it has boiled, lower the heat to minimum and simmer till reduced by half, 

stiring regularity.

Remove the bundle with spices.

Blend everything until you get a smooth sauce and strain it through a fine sieve.

The ketchup is ready.

Cool it and keep it in the fridge.

If you want you can reduce it again until you get the desired consistency.