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Cook until onions am soft, about 15 minutes. Remove from heat. Cool slightly until easy to handle and puree. iA handheld blender is the easiest because you can puree the whole thing in the pot, hut you can also use a stationary blender or food processor working in hatches and returning the pureed mixture to the pot.)
Add remaining ingredients to the pureed mixture. Return to heat and continue cooking over medium until reduced by half, about 50 minutes Stir occasionally, then more often as ketchup thickens to prevent scorching. Remove from heat and ladle into heat-proof, nonreactive containers
Refrigerate at least overnight before serving to allow the flavors to develop Keep indefinitely in the refrigerator and the flavor gets better and better.
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