layered southwestern salad

Ingredients

• 1/3 cup fresh cilanto
• 1/2 cup lime juice
• 1/2 cup olive oil
• 1/2 cup sour cream
• 1 teaspoon sugar
• 1/2 teaspoon salt
• 1/2 teaspoon pepper
• 16 ounces packaged romaine lettuce, shredded
• 5 - plum tomatoes, chopped
• 15 ounces can black beans, rinsed and drained
• 1 small purple onion, chopped
• 8 ounces package shredded mexican 4 cheese blend
• 15 ounces whole kernel corn with red and green peppers, drained
• 6 ounces can sliced ripe olives, drained
• 2 cups crushed tortilla chips
• - garnish: fresh cilantro leaves