Ingredients
- 2 Tbsp. vegetable oil
- 3 lb. boneless pork shoulder (Boston butt), patted dry
- 1 3" piece ginger, scrubbed, thinly sliced
- 1 cup dry sake
- ¾ cup light soy sauce (such as Kimlan)
- ½ cup (packed) plus 1 Tbsp. ground black sugar or dark brown sugar
- 2 tsp. hon-dashi (bonito stock powder)
- 2 red Thai chiles, thinly sliced
- 1 cup distilled white vinegar
- 1 tsp. Diamond Crystal or ½ tsp. Morton kosher salt, plus more to taste
- ½ daikon (about 12 oz.), peeled, cut into 4" pieces
- 2 Tbsp. (or more) unsalted butter
- 4–6 Hawaiian or other soft hamburger buns
- Cilantro leaves with tender stems (for serving)