In a medium pot, bring water to a boil. Remove from heat. Add couscous and give it a quick stir with a fork. Cover the pot and let it sit for 10-15 minutes. Remove the lid and fluff with a fork.
In a large bowl, combine the couscous, baby corn, olives and fresh coriander. In a small bowl, whisk together the olive oil, soy sauce, lemon juice and pepper. Pour the dressing over the couscous mixture and toss. Taste and adjust seasonings. Serve couscous salad at room temperature.