Prepare the couscous according to the package directions; set aside.
In a large skillet, over medium-low heat, heat the oil. Add the onion, salt, and 1/8 teaspoon of the black pepper. Cover and cook until the onion is softened, 5 to 7 minutes. Add the bell pepper and raisins and cook for 4 minutes more. Add the tomatoes and heat for 3 minutes.
Meanwhile, place the shrimp in a medium bowl and sprinkle with the cumin, cinnamon, and the remaining black pepper. Squeeze the lemon over the shrimp and toss to combine. Add the shrimp (but not the liquid) to the tomato mixture in the skillet. Cook, stirring occasionally, until the shrimp are pink and cooked through, about 3 minutes. Fluff the couscous with a fork, divide it among individual plates, and spoon the shrimp over the top.
Tip: Add flavor and color by stirring about 3 tablespoons of chopped fresh parsley, cilantro, or scallions into the couscous just before serving.