"The marinade—a sweet, spicy, tangy mixture of chiles, garlic, Sprite, vinegar, and dried mushrooms—is so full of flavor, we don't want even one drop of it to go to waste. That's why we simmer the leftovers (in a pot on the grill!), then use it to baste the skewers as they cook...."
INGREDIENTS
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2 lb. skinless, boneless pork shoulder
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½ small red onion, thinly sliced
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12 red Thai chiles, coarsely chopped
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8 garlic cloves, coarsely chopped
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1 cup Sprite or 7UP
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½ cup soy sauce
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⅓ cup cane vinegar (such as Datu Puti) or unseasoned rice vinegar
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¼ cup sugar
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1 Tbsp. black peppercorns
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1 Tbsp. kosher salt, plus more
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6 dried shiitake mushrooms
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A spice mill or mortar and pestle; twelve to sixteen 8" metal skewers or soaked wooden chopsticks or bamboo skewers