Freshly ground black pepper
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METHOD:
FOR THE SAUCE:
Preheat oven to 375°. Puree tomatoes, apple cider vinegar, red pepper flakes, onion powder, garlic powder, and oregano in a blender; season with salt and pepper.
In a large deep skillet (or large pot) over medium heat, heat oil. Add pureed tomato sauce, bring to a simmer, then lower to medium-low and simmer for 20 minutes, until slightly thickened.