In a roasting pan, simmer lemongrass, spices, and garlic in a lot of water.
Separate ribs by cutting between bones. Place on baking rack (may overlap slightly to fit all bones on rack). See recipe card.
Place rack over simmering water in roaster. Cover tightly with foil.
Bake 2 hours at 350F.
Remove ribs to sheet pan. Cover with BBQ sauce.
Bake for 20 minutes at 350F.