保持绿色，这从网上抄来的。

Bring a large pot of water to a boil. Add enough salt so it tastes salty. Prepare a large bowl of ice water. Put basil leaves in boiling water. Cook 30 seconds (or less) and drain. Immediately put basil in ice water. Swish around until completely cooled. Drain and, using your hands, squeeze water from basil leaves.