Carefully gather strips of the bark at the New Moon. With red Doves Blood ink, write on a birch strip:
"Bring me true love."
Burn this along with a love incense, saying
"Goddess of love, God of desire,
Bring to me sweet passion's fire."
The specific name of a god/goddess may be added. Or cast the bark into a stream or other flowing water, saying:
"Message of love, I set you free,
to capture a love and return to me."
Remember: It is unwise to use this incantation and ritual directed toward a specific person as that would violate the rule. If a love is to come to you, it must be of that persons free will to do so.