Preheat oven to 375 degrees.
Cut eggplant in half and roast cut side down on an oiled cookie sheet for about 30 minutes until soft.
Cut the bell pepper in half and discard the seeds and membranes.
Flatten the pepper with your palm so there is more surface exposed and roast about 30 minutes in the oven until the skin blackens.
Carefully place the pepper in a bowl and cover with a plate to allow it to steam further. When cool, peel off the skin and scoop out the pulp. Discard the skin.
Saute the onion in 1 to 2 tablespoons of olive oil until soft. Add the garlic and saute' for 2-3 minutes longer until brown.
Puree the vegetable (eggplant, pepper, onion and garlic) in a food processor until smooth or simply mix and leave chunky.
Stir in the rest of ingredients, salt to taste and serve at room temperature with pita chips.