INGREDIENTS
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2 teaspoons sesame seeds, preferably toasted, plus more for optional garnish (see NOTE)
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1 large yellow onion, cut in half, then thinly sliced
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6 to 8 scallions, trimmed and cut crosswise into thin slices, plus more cut scallions for optional garnish
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4 cloves garlic, minced
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1 cup low-sodium soy sauce or tamari
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1 cup rice wine (mirin)
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2 pounds lean sirloin or top round, trimmed of excess fat, then thinly sliced (see headnote)
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About 1 tablespoon toasted sesame oil
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2 heads lettuce, separated into leaves, rinsed and dried