Preheat your oven to 180°C (350°F).
In a large ovenproof skillet or casserole dish, heat some olive oil over medium heat. Add the sausages and cook until browned on all sides, about 5-7 minutes. Remove the sausages from the skillet and set aside.
In the same skillet, add the sliced onions, carrots, and celery. Cook until softened, about 5 minutes. Add the minced garlic and cook for another minute.
Stir in the chopped tomatoes, beef or vegetable broth, Worcestershire sauce, tomato paste, dried thyme, salt, and pepper. Bring to a simmer.
Return the sausages to the skillet, nestling them into the vegetable mixture. Arrange the thinly sliced potatoes on top of the mixture in an overlapping pattern.
Drizzle the potatoes with a little olive oil and season with salt and pepper.
Cover the skillet or casserole dish with a lid or foil and transfer it to the preheated oven. Bake for 45 minutes.
After 45 minutes, remove the lid or foil and continue baking for another 15-20 minutes or until the potatoes are golden brown and crispy.
Once done, remove the hotpot from the oven and let it rest for a few minutes before serving.
Garnish with chopped fresh parsley if desired, and serve hot.
Enjoy your delicious Cumberland Sausage Hotpot!