Heat oil in a large skillet over medium-high heat. Saute onion, carrot, and celery until fragrant, 3 to 4 minutes. Add peanuts, sesame seeds, bay leaf, and salt, stirring often. When the vegetables are tender and the seeds and peanuts have toasted, add the attieke, stirring constantly. Pour the water over the entire pan, distributing evenly.
Cover and reduce the heat to medium, allowing the couscous to steam until it is moist and heated all the way through, about 5 minutes.
Remove the cover and fold the couscous with a spatula. Do not stir, as this will mash the couscous, just use a folding maneuver to mix the ingredients from the bottom upwards and let the couscous breathe to help the water evaporate. Top with chopped cilantro.