Set Instant Pot to the saute setting. Add the 1 tablespoon olive oil and allow to heat for 1 minute. Add the 1 medium onion, 4 medium carrots and 4 stalks celery and cook, stirring occasionally, until softened, 5 -7 minutes. Stir in the 4 cloves garlic and cook for 1 minute longer.
Add the 4 cups chopped cabbage, 1 bell pepper, 1 zucchini, 1 14-ounce can diced tomatoes, 8 cups bone broth, 1 bay leaf, 1 teaspoon oregano, 1 teaspoon basil, ½ teaspoon red pepper flakes and 1 teaspoon salt and 1/2 teaspoon black pepper . Stir to combine.
Put the lid on the Instant Pot, close the steam vent and set to HIGH pressure using the manual setting. Decrease the time to 4 minutes. It will take about 15 minutes for the pressure to build, then the timer will start.
Once the time is expired, wait for 5 minutes, then carefully use the quick release valve to release the steam. Season to taste with salt and pepper. Serve.
Stovetop
Heat the 1 tablespoon olive oil in a large saucepan set over medium heat. Add the 1 medium onion, 4 medium carrots and 4 stalks celery and cook, stirring occasionally, until softened, about 5 minutes. Stir in the 4 cloves garlic and cook for 1 minute longer.
Add the 4 cups chopped cabbage, 1 bell pepper, 1 zucchini, 1 14-ounce can diced tomatoes, 8 cups bone broth, 1 bay leaf, spices and salt and pepper. Stir to combine.
Bring to a boil, then reduce heat and simmer for 20 minutes, stirring occasionally.
Season to taste with salt and pepper. Serve.
Slow Cooker
Add all ingredients to a slow cooker.
Cook on LOW for 8 hours or HIGH for 5 hours.
Video
Notes
Leftovers will keep in the fridge for up to one week. Or, freeze for up to three months.