Marinated Shrimp-and-Artichokes

INGREDIENTS

• 1/4 cup white balsamic vinegar
• 2 tablespoons finely chopped fresh parsley
• 2 tablespoons finely chopped green onion
• 3 tablespoons olive oil
• 1 (0.75-oz.) envelope garlic-and-herb dressing mix
• 1 pound peeled and deveined, large cooked shrimp (2 1/30 count)
• 1 (14-oz.) can artichoke hearts, drained and cut in half
• 1 (6-oz.) can large black olives, drained
• 1 cup halved grape tomatoes
• 1 (4-oz.) package feta cheese, cut into 1/2-inch cubes
• Small fresh basil leaves