How to Make It
Process nectar, garlic, ginger, soy sauce, sugar, sesame oil, and chili-garlic sauce in a blender until smooth, about 2 minutes. Pour into a large ziplock bag. Add beef; seal bag and turn to coat. Let stand at room temperature for 30 minutes or refrigerate for up to 8 hours.
Heat 1 tablespoon canola oil in a large cast-iron skillet over medium-high. Add a quarter of beef; spread in a single layer. Cook, flipping once, until browned, 2 to 3 minutes per side. Transfer to a platter. Repeat, in batches, with remaining 3 tablespoons canola oil and beef. (Discard leftover marinade.) Top with scallions and sesame seeds. Serve with rice or lettuce cups.
Storing and reheating: Freeze cooked beef in ziplock bags for up to 1 month. To thaw, run bag under warm water until mixture comes loose. Transfer beef to a skillet and add 2 to 3 tablespoons water. Gently heat over medium, stirring occasionally, until warmed through.