blueberry romaine salad

Ingredients

• 1/3 cup white vinegar
• 1/4 cup sugar
• 1 tablespoon chopped red onion
• 2 teaspoons poppy seeds
• 1 teaspoon ground mustard
• 1/2 teaspoon salt
• 1/4 teaspoon pepper
• Dash Worcestershire sauce
• 1 cup canola oil
• 1 package (10 ounces) hearts of romaine salad mix
• 1 cup unsalted cashews
• 1 cup shredded Swiss cheese
• 1 cup fresh blueberries