Final answer:
Samantha's special treat for Henry is Dragon beard candy.
Step-by-step explanation:
Samantha's special treat for Henry is Dragon beard candy. This is evident from the text provided that mentions the presentation of white and red rice as well as ten jars of live abalone, but Samantha's special treat is not mentioned in that context. Dragon beard candy is a traditional Chinese sweet that is made by stretching and twisting a mixture of maltose syrup and sugar until it forms thin strands resembling a long white beard, hence the name.