Upside-Down Onion Tart

Yield:	8 Servings
Categories:	Vegetables

1	lg	Baking potato, (1 pound)
2	tb	Olive oil
1/8	ts	Salt
1/8	ts	Pepper
		Vegetable cooking spray
1	ts	Olive oil
3	c	Thinly sliced leek
3	tb	Neufchatel or lite ricotta cheese
3	tb	Grated fresh Romano cheese
3	tb	Grated fresh Parmesan cheese
1/2	ts	Dried thyme
1	tb	Butter
1	tb	Sugar
3	md	Vidalia onions, (1-3/4 pounds) peeled and halved
2	md	Red onions, (1 pound) peeled and quartered
2	sm	Onions, peeled and halved
3	tb	Rice vinegar
1	tb	Grated peeled gingerroot
2	lg	Cloves garlic, sliced
		Fresh thyme sprigs
		Pepper