Couscous Tabbouleh

Name: Couscous Tabbouleh
Ingredients: 1 ½ cups Moroccan couscous ((the small kind)); 1 teaspoon ground turmeric ((optional)); 1 teaspoon salt ((or to taste)); 1 ½ 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))