Make-Ahead Veggie Salad

Ingredients

• 1 package (24 ounces) frozen shoepeg corn, thawed
• 1 package (16 ounces) frozen peas, thawed
• 1 package (16 ounces) frozen French-style green beans, thawed
• 1 large red onion, chopped
• 4 celery ribs, thinly sliced
• 2 medium carrots, thinly sliced
• 1 medium green pepper, chopped
• 1 medium sweet red pepper, chopped
• 1 jar (4-1/2 ounces) sliced mushrooms, drained
• 1 jar (4 ounces) diced pimientos, drained
• 1/2 cup sugar
• 1/2 cup olive oil
• 1/2 cup red wine vinegar
• 3/4 teaspoon salt
• 1/4 teaspoon pepper