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Begin by cutting the whole onion through the root end to keep it intact.
In a pot, combine the onion, two cans of San Marzano or other whole peeled tomatoes, ten tablespoons of grass-fed butter, and a generous amount of sea salt.
Stir the mixture together and place it on the stove over high heat.
Once it reaches a boil, reduce the heat to a low simmer, stirring constantly.
Allow it to simmer for 45 minutes, or until the onions become very soft.
You can then remove the onions for another use if desired.
Finally, puree the tomato sauce and incorporate it into your favorite dish.