Couscous with Orange and Almonds

Name: Couscous with Orange and Almonds
Ingredients: 2 cups instant couscous; 2 cups boiling water; 1 teaspoon salt, plus more for seasoning; 1 teaspoon finely grated orange zest; 2 tablespoons fresh orange juice; 2 tablespoons red wine vinegar; 1/4 cup extra-virgin olive oil; 1/2 medium onion, thinly sliced; 1 orange, peeled, segmented and diced; 3 tablespoons finely chopped fresh mint leaves; 3 tablespoons finely chopped fresh flat-leaf parsley; 1 head radicchio, shredded; Freshly ground black pepper; Toasted slivered almonds