Good-Cooking - Salad with Raspberry Dressing

Ingredients

• 1/3 cup salad oil
• 2 tablespoons raspberry vinegar
• 3 tablespoons granulated sugar
• 1 tablespoon sour cream
• 1 1/2 teaspoons Dijon mustard
• 1/2 cup fresh raspberries (or 1 package frozen, without syrup)
• 1 cup torn Romaine lettuce
• 1 cup torn green leaf lettuce
• 1 cup head lettuce
• 1 cup Bibb lettuce
• 1 (8 1/2 ounce) can baby artichokes, drained
• 1/2 cup walnuts, toasted