Why did Wu Zhi send hemp candy when he got married?

Tell people that my daughter is engaged. According to the custom of Wu Zhi, young men and women get married and choose an auspicious day. Before the wedding, the woman should ask the man for rare sweet sesame candy. This has two meanings: "rareness" is the homonym of happiness, and "sweetness" means sweetness; The second meaning is that after receiving the sesame candy, the woman should pass it on to all her relatives and friends and tell them, "My daughter is engaged, so I chose an auspicious day to invite you to eat sesame candy and go to see her off that day."