Couscous Tabbouleh Mint Salad

Name: Couscous Tabbouleh Mint Salad
Ingredients: 1½ cups Moroccan couscous; 1 teaspoon ground turmeric (optional); 1 teaspoon salt, or to taste; 1½ cups boiling water or vegetable stock; 2 tablespoons olive oil; 2 tomatoes, finely diced; 1 cucumber, finely diced; ½ onion, finely diced; 1 cup fresh mint leaves, stems discarded and very finely minced; 2 cups fresh parsley leaves, stems discarded and very finely minced; ½ cup raisins (optional); ½ teaspoon freshly ground black pepper; 1 tablespoon lemon juice, from ½ lemon, or more to taste