1. Preheat oven to 325°F. Combine mirin, water, sweet chili garlic sauce, agave nectar, brown sugar and ginger in stockpot over medium heat stirring occasionally until sugar dissolves. Place beef ribs in stockpot; bring to a boil. Reduce heat; cover tightly. Continue cooking in 325°F oven 1-3/4 to 2 hours or until beef is fork-tender.
2. Remove beef; keep warm. Skim fat from cooking liquid. Bring to a boil; reduce heat and cook 12 to 15 minutes or until sauce is reduced by half. Stir in lime juice and soy sauce. Return beef to cooking liquid; cook 1 to 2 minutes or until heated through, stirring occasionally.
3. Sprinkle beef with chives, if desired. Serve with remaining sauce for dipping, if desired.
Test Kitchen Tips Beef ribs can be served on 6-inch wooden skewers or with wooden toothpicks.