How to Make It
Heat rice according to package directions. Set aside; keep warm.
Heat cumin and peppercorns in a large skillet over high. Cook 1 minute or until fragrant and toasted, stirring frequently. Cool slightly; crush with a mortar and pestle, or grind coarsely in an electric spice grinder.
Heat 2 teaspoons oil in pan over medium-high. Add half of lamb; stir-fry 3 minutes or until browned. Sprinkle with 1 teaspoon spice mixture. Transfer to a plate. Repeat procedure with remaining oil and lamb and 1 teaspoon spice mixture.
Add onion, bell pepper, and garlic to pan; stir-fry 4 minutes or until lightly charred. Add crushed red pepper and remaining spice mixture; stir-fry 1 minute. Add cooked lamb and any juices from plate, soy sauce, vinegar, salt, and sugar. Cook, tossing constantly, until liquid coats meat and vegetables. Remove from heat. Add scallions; toss to wilt. Serve stir-fry over rice. Sprinkle with Aleppo pepper, if desired.