Dark balsamic vinegar can be used, it will taste the same just be aware it will change the color of the salad.
I like to use chicken stock to add extra flavor to my couscous. Use water to keep the dish vegetarian.
You may need to add more dressing after the salad has sat in the fridge. The couscous tends to drink it up. And of course taste before serving and season with salt or pepper as needed.
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