Combine first 4 ingredients in heavy small saucepan. Boil over high heat until reduced by half, about 3 minutes. Add cream and boil until reduced by half, about 2 minutes. Reduce heat to low. Mix in chili-garlic sauce. Add butter, 1 piece at a time, whisking just until melted before adding next piece.
*Available in the Asian foods section of many supermarkets and at Asian markets.
