Slow Cooker Method

1. In a large skillet over medium-high heat, warm the oil.

2. Add the ground beef and diced onion. Cook for 5–7 minutes, breaking up the beef as it cooks, until no longer pink.

3. Add the minced garlic and sauté for 1 more minute until fragrant.

4. Drain any excess grease.

5. Transfer the beef/onion/garlic mixture into your slow cooker.

6. Add the potatoes, diced tomatoes (with their juices), beef broth, bell pepper, celery, dry mustard, relish, salt, and pepper. Stir gently to combine.

7. Cook on HIGH for 3–4 hours, or on LOW for 6–8 hours, until potatoes are tender and flavors meld.

8. Taste near the end and adjust salt or pepper as needed.

Instant Pot (Pressure Cooker) Method

1. Set the pressure cooker to Sauté mode. Heat the oil.

2. Add ground beef, diced bell pepper, onion, and celery. Cook for about 5–7 minutes, breaking apart the beef, until browned.

3. Add the minced garlic and sauté for 1 more minute until fragrant.

4. Drain off fat if needed.

5. Stir in the potatoes, diced tomatoes (with juices), beef broth, dry mustard, relish, salt, and pepper.

6. Secure the lid and seal the valve. Cook on High Pressure for 20 minutes.

7. When the cooking time ends, use Quick Release to drop the pressure.

8. Open carefully, give a stir, and taste to adjust seasonings.