Heat oil in a nonstick skillet over medium-high heat. Add onion, and saute 5 minutes or until onion begins to brown. Add vinegar, and bring to a boil, and cook 2 minutes or until vinegar evaporates. Cool to room temperature.
Drain chickpeas through a sieve over a bowl, reserving 1/4 cup liquid. Place chickpeas and chopped cilantro in a food processor, and process until mixture resembles coarse meal. Add onion mixture, 1/4 cup reserved liquid, cumin, pepper, and salt, and process until smooth. Garnish with cilantro sprigs, if desired.