Preheat your oven to 400 degrees Fahrenheit.
Brush a 6 or 8 inch cast iron pan with some olive oil.
Mix the 1/4 teaspoon salt and 1/8 teaspoon pepper with the 1/3 cup olive oil and set aside.
Arrange the sliced sweet potatoes in the pan as you see in the photo, going half way around the pan making a half circle.
Next, take the red beets and arrange them next to the sweet potatoes in an arc shape and then place the golden beets at the lower part of the pan.
Take the head of garlic and place it in the little space left at the bottom of the pan.
Using a pastry brush, coat all of the sweet potatoes first, the golden beets second and then the red beets with some olive oil.
Sprinkle with some coarse salt.
Place in the oven and roast for 1 hour. The veggies should be tender and browned along the top edges.
Remove from oven and allow to cool enough to handle the pan.
Sprinkle with the fresh herbs and serve.
The roasted garlic is wonderful squeezed out of the paper and spread onto some bread or eaten with the veggies.