Preheat oven to 400°F.
Line a baking sheet with aluminum foil.
Place eggplant on baking sheet. Place in preheated oven on center rack and bake until soft, about 30 minutes, turning often.
Remove from oven and allow to cool to touch.
Peel off skin. Remove stem ends.
Place eggplant pulp in blender or food processor. Purée until broken down a bit.
Add lemon juice.
While blending, gradually add tahini.
Crush garlic to a paste consistency. Mix with salt. Add to eggplant.
Continue to purée until smooth.
Taste. Add salt and pepper and/or more lemon juice, to taste.
Remove from blender or processor to a medium bowl.
Add yogurt and mix with a spoon.
Place in a mound in a shallow serving bowl.
Using a spoon, create a "well" in the middle of the mound. Pour olive oil into well and sprinkle around dish.
Sprinkle with parsley
Serve with pita bread.