Tuna Souvlaki Pasta Salad

Ingredients (12 items)

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• ½ red onion, cut into bite-size pieces
• 4 cups ice water, or as needed
• 1 (8 ounce) package tri-color rotini pasta
• 1 (5 ounce) can light tuna in water, drained and flaked
• 2 stalks celery, cut into bite-size pieces
• ½ cup roasted red peppers, drained and chopped
• ¼ cup smoked sun-dried tomatoes
• ¼ cup crumbled feta cheese
• 1 sprig parsley, stemmed and leaves minced
• 4 leaves fresh basil, rolled and very thinly sliced
• 2 teaspoons capers
• 1 cup Greek vinaigrette salad dressing