Bring the water to a boil. Place the couscous in a large heatproof bowl,a nd cover the boiling water. Using a fork,tir in the olive oil and salt. Cover, and set aside for about 5 minutes.

Mix the artichoke hearts, scallions, garlic, parsley, dill, and optional mint and/or tarragon into the cooked couscous. Stir int he oil, lemon juice, and walnuts. Add salt and pepper to taste.

Serve plain or on a bed of fresh greens, either at room temperature or chilled.