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1
Combine soy sauce, mirin, rice vinegar, and sesame oil in small bowl; set dipping sauce aside.
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2
Heat charcoal grill or cast-iron griddle to high heat (until wisps of smoke appear).
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3
Arrange pork belly slices directly on grill; cook without moving 3–4 minutes until fat renders and surface chars.
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4
Flip each slice; cook 2 minutes until cooked through, fat fully rendered.
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5
Transfer to serving platter; immediately sprinkle with cracked pepper, toasted sesame seeds, sliced garlic, and scallion batons.
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6
Serve with dipping sauce, steamed rice, and fresh lettuce leaves for wrapping.