In a small bowl, whisk together the vinegar, basil, garlic, and salt. Continue to whisk and add the oil in a steady stream, then set aside.
3 tablespoons cider vinegar, 1 teaspoon dried basil leaves, 1 garlic clove, ⅛ teaspoon kosher salt, 2 tablespoons extra-virgin olive oil
Bring the water to a boil in a medium saucepan. Once boiling, add the couscous, cover, and cook on medium-low heat until tender (about 10 minutes).
1¼ cups water, 4 ounces whole-wheat pearl couscous
Drain the water, run the couscous under cold water, and let it drain again while you make the salad.
In a large bowl, mix together the cucumber, tomatoes, onion, beans, and cheese.
1 cucumber, 1 cup grape or cherry tomatoes, ½ cup onion, 14 ounces beans, 2 ounces fresh mozzarella cheese
Add the cooled couscous and dressing, then toss to combine.