Cook couscous: Bring a large saucepan of salted water to a boil. Add couscous and cook according to the package directions, usually 8 to 10 minutes. Drain.
Make dressing: While the couscous cooks, in a large bowl, whisk the oil, mustard, honey, lemon zest, lemon juice, ½ teaspoon of salt, and ¼ teaspoon of pepper.
Make the salad: Mix the drained couscous (still hot) with the dressing. Cool for 5 minutes or until it is warm, not hot.
Stir in the cucumber, tomato, herbs, walnuts, and raisins. Taste for seasoning and adjust with salt and/or pepper as needed. Enjoy warm or cold.
