During the Boon Haw Khao Slak ceremony, families prepare elaborate offering baskets containing monk necessities, seasonal fruits, traditional foods, and personal care items. Each family writes their names and the names of ancestors they wish to honor on small slips of paper (salak). These slips are placed in a bowl, and in a ceremonial drawing, monks randomly select the slips to determine which family's offerings they will receive. The matching process is often accompanied by festive music and joyful anticipation. After the drawing, families present their offerings to their matched monks, who chant blessings and transfer merit to the named ancestors. The ceremony combines elements of solemn remembrance with the excitement of the lottery drawing, creating a unique atmosphere that balances reverence with community celebration. The random matching is believed to create special karmic connections between donors and recipients.