Preheat oven to 450. Make sure greens are removed from the beets, then wrap them in aluminum foil, and place them inside a small baking dish. Roast until beets are soft enough to easily pierce with a knife, about 45-60 minutes. Allow to cool, then using a paper towel, rub the beets to remove the skin.

Slice beets thinly and place into a medium sized bowl (makes about 2 cups). Chop 3 garlic cloves, and place them on top of the beets. Season with salt and pepper. Then add vinegar and cilantro. Cover with a lid, and shake a bit to mix up. Refrigerate at least 4 hours or overnight.

Spray a large, nonstick skillet lightly with an olive oil mister and set over medium high heat. Add spinach, remaining to garlic cloves (minced), and a bit of salt and pepper. Sauté, tossing frequently, until spinach is wilted.

Toast each sandwich roll, then divide the goat cheese, beets and spinach evenly amongst the rolls.