Several of all 3 as well as a couple sweet potatoes and carrots. Heck, a couple potatoes and red onions if you want as well. But any combination will do. I've thrown in a butter nut squash too if it was brave enough to be on the counter
Cube it all up (large cubes).
1. Preheat oven to 475 degrees F (245 degrees C).
2. Combine all the veggies into a large bowl. If using onions seperate the chunks.
3. In a small bowl, stir together some thyme, rosemary, olive oil, vinegar, salt, and pepper. Toss with vegetables until they are coated. Spread evenly on a large roasting pan or place into a large roaster (I use a #9 oval roaster for this)
4. Roast for 35 to 40 minutes in the preheated oven, stirring every 10 minutes, or until vegetables are cooked through and browned.
I stir and check occasionally and should for a nice carmelization on everything. I often go longer than the 40 minutes, but just don't get them too soft. I will jack the temp up if they are taking longer than usual to get to where I want them.
I like using the big roaster (uncovered) rather than a pan because it's easier to toss them and you get the additional even heat from the sides.
Good as is, add a little good balsamic before serving or anything else you like on your roots.
Of course this all works well added into and cooked with a roast. When I do that I'll usually throw chunks of celery in.