Cut lobster tails in half lengthwise, cutting through upper and lower hard shells with an electric knife.
Heat butter in a large skillet over medium heat until butter melts.
Add lobster tail halves, cut side down. Cook 4 minutes on each side or until lobster is done.
Remove lobster from skillet, and keep warm.
Add gingerroot, curry powder, and garlic to skillet.
Saute over medium-high heat 2 to 3 minutes.
Add half-and-half and next 6 ingredients; stir well. Cook over medium-high heat, stirring constantly, 10 to 12 minutes or until mixture is reduced to 1/2 cup.
Spoon 1/4 cup curry mixture onto each individual serving plate.
Place 2 lobster tail halves, cut side down, on each plate.