Stir together the couscous, lemon juice and olive oil
. Set aside to plump and soften, 1 to 2 hours, at room temperature, stirring occasionally. It's ready when the grains are al dente
Stir through the herbs
, tomatoes, pepper and onion
. Season well with salt and pepper, adding more lemon juice to taste if needed. Cover and refrigerate overnight if not using right away.