Add remaining ingredients and whisk to blend. Strain egg mixture into another large bowl. Pour custard into another large bowl. Pour custard into prepared ramekins, dividing equally. Pour enough hot water into baking pan to come halfway up sides of ramekins.
Transfer flans to rack and cool.
Cover and chill overnight. Turn over onto plate. Lift off ramekin, allowing syrup to run over flan. Repeat with remaining flans.