Thoroughly wash the chitterlings by soaking them in vinegar, baking soda, salt, and water for about an hour. After that, rinse twice under running tap water.
Then remove excess fat, and cut the chitterlings into small bite-size pieces. Transfer them to a medium-sized pot and completely cover them with water. Cook over medium-high heat for about an hour.
After cooking, rinse the chitterlings one more time with fresh water. Rinse the pot and place it over medium heat.
Pour a tablespoon of cooking oil into the pot, and when it's hot, add the onion, garlic, thyme, bell pepper, and celery. Sauté for 2-3 minutes until the onion is translucent.
Add bay leaves, Creole seasoning, pepper flakes, vinegar, chitterlings, and two cups of water—season with salt and pepper to taste.
Cover pot and cook for 45-60 minutes or until chitterlings are tender. To ensure the water hasn't cooked out, check the pot, stirring occasionally. Add more water as needed.
Serve and enjoy!