A memorandum to expand cooperation in wine related business between Hong Kong and the United Stated was signed here in Hong Kong on Monday.The Secretary for Commerce and Economic Development Rita Lau signed the Memorandum of Understanding on Co-operation in Wine- related Businesses (MOU) with the visiting Secretary of Commerce of the United States Gary Locke."Today, our relationship with the U.S. takes another major step forward. Riding on this MOU, we will strengthen our joint efforts on promoting wine-related trading, tourism, investment and education," Lau said.