How to Make It
Heat broiler. Cook the brown rice according to the package directions.
Combine the cilantro, shallot, vinegar, red pepper, 2 tablespoons of the oil, and a pinch salt in a small bowl.
Combine the halibut, mushrooms, scallions, the remaining tablespoon of oil, and a pinch each of salt and black pepper in a medium bowl. Thread onto skewers. Broil, turning once, until the halibut is opaque throughout, 7 to 9 minutes.
Serve the kebabs over the brown rice with the sauce.