Prepare the vegetables. You may peel or not peel. Cut all the vegetables to a similar size so they cook at an even rate, thus not getting some over-cooked, while others are raw.
Herb Oil
Remove the leaves from the thyme and rosemary, then roughly chop them up.
Combine the thyme, rosemary, garlic, and oil in a small bowl.
To Cook
Place the prepared vegetables in a Dutch oven then tip the herb oil over the top. Gently toss the vegetables so they are completely covered in the oil and herbs.
Place the lid on the Dutch oven, then bring to a temperature of about 350 degrees F (180 degrees C). Cook for about 1 hour, turning the vegetables once during this time.