Ingredients
FOR THE SAUCE:
1 1⁄2 cups ketchup
3⁄4 cup frozen lilikoi juice concentrate, thawed
1⁄4 cup lightly packed brown sugar
3 tbsp. honey
3 tbsp. light corn syrup
2 tbsp. oyster sauce
1 tbsp. rice vinegar
1⁄4 tsp. worcestershire
1⁄4 tsp. Tabasco
1 clove garlic, chopped
Preparation
For the sauce: Put ketchup, lilikoi juice concentrate, sugar, honey, corn syrup, oyster sauce, vinegar, worcestershire, Tabasco, and garlic into a medium pot and bring to a boil over medium heat. Reduce heat to medium-low and simmer, stirring often, until very thick, about 1 hour.
For the ribs: Meanwhile, put 8 quarts of water into a large pot and bring to a boil over high heat. Add vinegar, garlic, ginger, salt, and pepper, reduce heat to medium, and simmer for 5 minutes. Add ribs and continue to simmer, partially covered, until tender, about 1 hour. Drain ribs, pat dry, and arrange in a single layer on a sheet pan fitted with a rack.
Arrange oven rack 3-4 inches from broiler element and preheat broiler. Generously baste one side of ribs with some of the sauce and broil until sauce dries slightly and begins to bubble, about 2 minutes. Flip ribs, baste generously again, and broil for 2 minutes more. Repeat flipping, basting, and broiling process 3 more times, until ribs are well lacquered and beginning to char slightly.
Cut ribs apart, stack evenly on 4 warm plates, and garnish with sprigs of watercress. Serve immediately