It should be frozen coconut milk that is defrosted. Lemon extract can be subsituted for 2 drops of lemon juice. Conversions were made with: http://www.jsward.com/cooking/conversion.shtml
When covering with plastic wrap, make sure the wrap is touching the haupia completely. It is better to refridgerate that haupia overnight for best results. For the full recipe and details, refer to: http://www.foodland.com/print/100661