combine all ingredients in a large non-reactive pot and bring to a boil, reduce heat and simmer stirring regularly and simmer until it reduces to a sticky jammy mess. This will take about 1 - 1 1/2 Hours.
Remove from heat and place in sterile jars leaving 1/4 inch headroom for expansion. Process in boiling water for 20 minutes.
You did not miss a step, DO NOT PEEL AND SEED tomatoes.