Preheat broiler. Place eggplant on a baking sheet and broil, turning occasionally, until charred all over and softened, about 40 minutes. Set aside to cool.
When cool enough to handle, peel eggplant and roughly chop, reserving liquid. Transfer to a large bowl. Mix in remaining ingredients and season to taste with salt and pepper. Serve chilled or at room temperature, with pita triangles.
Variation: Make humus by substituting canned garbanzo beans for the eggplant.