Bulgogi — thin-sliced beef marinated in a soy-sugar-sesame-pear base and grilled — is one of the most technically instructive Korean preparations because its marinade achieves three simultaneous effects: flavouring (soy, garlic, sesame, green onion), tenderising (the enzymes in Asian pear or kiwi digest the beef's muscle proteins during marination), and caramelisation (the high sugar content produces rapid Maillard browning at the grill surface).
- **The beef:** Thinly sliced sirloin or ribeye — 2–3mm. The thin cut is essential: it cooks through in 2–3 minutes at grill temperature, and the marinade penetrates the thin slice completely. - **The marinade:** Soy sauce, sugar, sesame oil, sesame seeds, garlic, green onion, and grated Asian pear or kiwi. - **The enzyme tenderiser:** Asian pear contains proteases (actinidin and similar enzymes) that digest the beef's myosin proteins during marination, producing the characteristic tenderness. Over-marinating (more than 24 hours) produces a mushy texture — the enzymes break down too much protein structure. - **The caramelisation:** The sugar in the marinade produces rapid Maillard-and-caramelisation browning — the sweet, slightly charred exterior is what distinguishes grilled bulgogi from braised beef. - **Marination time:** 30 minutes minimum; 4–8 hours ideal; 24 hours maximum. [VERIFY] Maangchi's specific marination guidance. - **Cooking surface:** Direct flame grill (for charred edges) or a very hot cast iron pan (for home cooking). The surface must be very hot — the thin slices cook so quickly that any failure to sear immediately produces steaming rather than browning. Decisive moment: The surface caramelisation — the moment the sugar in the marinade produces the first dark spots on the meat's surface. The thin slice cooks through in the same time it takes to caramelise the surface (2–3 minutes). Do not touch the meat until the first dark spots appear.
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