Steam fish for approximately 20 minutes. Check the thickest part of the fish to see if done. Chill grouper until cool. In a medium size bowl chunk grouper with a fork. Next, add diced vegetables, mayo, horseradish, juice from 2 lime wedges, cilantro, and salt to taste. Chill in refrigerator for at least 15 minutes. Serve over fresh leaf spinach or fresh lettuce.