Silky sauteed peppers and onions get bumped up with flavor from the addition of garlic, anchovies, and oregano. Peperonata can be used in so many ways!
Heat the oil in a large, deep skillet or pan over medium heat. Add the onions, season with salt and pepper, and sauté for 5 minutes, until softened.
Add the garlic and anchovies and stir for a minute or two until you can smell the garlic and the anchovies start to melt into the oil.
Add the peppers and tomatoes, season again with salt and pepper as well as the oregano, and cook over medium-low heat for about 30 minutes until all of the vegetables are soft but not mushy.
Add the red wine vinegar if using. Taste and adjust seasonings.
Cool to room temperature and serve.
Notes
Peperonata can be stored in an airtight container in the refrigerator for up to a week. Enjoy chilled or bring to room temperature before serving.