No need to cook the frozen artichoke hearts–just thaw, and pat dry.
Place lettuce in a 4-qt. bowl. Arrange artichoke hearts and next 5 ingredients over lettuce. Top with dressing; gently toss to combine. Sprinkle with cracked black pepper, if desired. Serve immediately.
*1 (14-oz.) can artichoke hearts, drained, may be substituted.