Step 1 Crack crab claws and remove crab meat. Cut shrimp into 1-inch pieces and toss with crabmeat in bowl. Set aside.
Step 2 Combine mayonnaise, mustard, garlic and capers in bowl. Whisk in oil and lemon juice. Stir in chives.
Step 3Pour dressing over seafood and toss. Cover and chill 30 minutes for flavors to blend. To serve, spoon 1/2 cup seafood onto bed of cilantro leaves. Sprinkle with pepper.