This short adventure was given away with orders from the TSR Mail Order Hobby Shop in 1992. Most came without a cover.
From the introduction:
The Jade Hare is a DUNGEONS & DRAGONS game adventure, designed for a party of 4-6 first level characters. As usual, a variety of character classes will be most useful. Because the adventure’s short, you and your players should be able to finish in just one session, even if you must generate player characters in the same evening.