How to Make It
Light the grill. In a small glass or stainless-steel bowl, combine the soy sauce, lime juice, oil, garlic, ginger, pepper, and salt. Put the hens into two large glass dishes. Pour 1/2 cup of the marinade over them and turn to coat. Let marinate, turning once, for 10 minutes.
Cook the hens over moderate heat for 12 minutes. Turn and cook until just done, about 12 minutes longer.
Meanwhile, snap off and discard the tough ends of the asparagus. In a medium bowl, toss the asparagus spears with 2 tablespoons of the remaining marinade and grill for about 12 minutes, turning once.
In the same bowl, toss the mushrooms with the remaining 2 tablespoons marinade and grill for about 5 minutes per side. Serve the hens with the asparagus and mushrooms alongside.