Pulse 3/4 cup of the cilantro, the scallion whites, chipotles, chili powder, lime juice, 2 teaspoons of the salt, and 1 tablespoon of the olive oil in a mini-food processor to make a smooth paste. Coat the steak with the paste. Toss the peppers and onion with 1 tablespoon of the olive oil, and 1/2 teaspoon salt.
Toast the cumin seeds in a small dry skillet over medium-high heat, about 1 minute. Mix seeds with the cabbage, remaining scallion greens, and remaining 1/4 cup cilantro in a large bowl. Set aside.
Set a rack 6-inch from the broiler heating element and preheat the broiler. Preheat a broiler pan for about 10 minutes.
Carefully pull the preheated pan from the broiler, set the steak in the center of the pan, and surround (but do not cover) with the peppers and onion. Return to the broiler. Cook until the meat feels firm but still gives gently when pressed, about 12 minutes for medium rare. Remove steak to a platter and let rest about 10 minutes before slicing. Toss the vegetables, and continue broiling until they soften and char, another 6 to 8 minutes.
Dress slaw with orange juice and zest, lime zest, 1 1/2 teaspoons salt and 1 tablespoon oil.
Slice the steak, against the grain, into very thin slices. Arrange on a platter with the peppers and onions. Serve with the slaw.
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From Food Network Kitchens