1. Prepare rice according to package directions. Meanwhile, cook peas and 1 tsp. salt in water to cover in a large saucepan over medium-high heat, stirring often, 30 minutes or until tender; drain.
2. Whisk together lemon juice, next 4 ingredients, and remaining 1 tsp. salt in a large bowl. Stir in peas, rice, celery, parsley, and mint until blended. Cover and chill 2 hours. Season with salt to taste.