Combine everything except the parsley in a slow cooker. Cover and cook on high for four hours.
Puree the sauce using an immersion blender until smooth. Stir in the fresh herbs.
Store the tomato sauce for up to a week in the refrigerator or store in the freezer for several months.
Notes
Look for salt pork near the meat counter at the grocery store.
Because the sauce is pureed the vegetables just need a rough chop. If you like a chunkier sauce, chop the vegetables smaller and skip the pureeing step in the recipe.
The recipe calls for 1 teaspoon of salt, but depending on how you use the sauce you may want to season it a little more. I left it a little under-seasoned since I use the sauce in different recipes that may have extra salt.
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