Slice onion, garlic and the chives than put it with the tomato sauce in a large pot and cook for about an hour on moderate heat.
After than sieve the sauce with the onion, add vinegar and sugar and cook for more 20' with vinegar and sugar.
Grind cloves and grate the nutmeg.
Add all species and cook for more 10'.
Remove the laurel leaf and cool, finally add the potato flour and cook for more 10'.
Let cool, and put in the fridge, ready to dish.