In a large bowl, add couscous, cumin and water. Cover bowl with plastic wrap and let stand for five minutes. Add olives, cilantro, tomatoes, lemon juice and salt and pepper to taste. In a hot skillet, add 1 tablespoon of the olive oil; lightly sauté the garlic, shrimp, and clams. Add clam juice; cover and cook until the clams open and the shrimp is cooked. Add the seafood mixture to the couscous. Add the remaining olive oil and salt and pepper to taste; toss. To serve, place in a bowl with seafood on top; garnish with parsley. Makes 2 to 3 servings.