Place all the step 1 ingredients into a large stockpot and simmer slowly for about 45 mins or until ⅓ of the juices have been evaporated. Stir frequently whilst cooking.
Remove from the heat and allow the mixture to cool.
Once cooled place the tomato mixture in a food processor or blender and blend on HIGH for about 1 minute
Strain the blended mixture through a sieve and into a sauce pan, making sure you have extracted as much juice as possible from the pulp.
Place the saucepan on a medium heat and add the step 2 ingredients and allow to simmer for about 10-15 mins. (if you prefer a thinner consistency do this step for 5 minutes)
Once cooked store in a sterilised jar for up to 3 weeks in the refrigerator