1 3/4 to 2 pounds skirt steak, trimmed and cut crosswise into 4-inch pieces
3 tablespoons sesame seeds
4 cloves garlic, smashed
1 cup cola
1/4 cup soy sauce
1/4 cup packed dark brown sugar
1/4 cup toasted sesame oil
Kosher salt and freshly ground pepper
1 large white onion, cut into 2-inch-thick wedges
2 to 3 banana or Cubanelle peppers

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