Laba garlic and vinegar with dumplings are traditional foods for the Spring Festival in China.
Businessmen usually count their financial income and expenditure of the year in lunar December eighth, and creditors also collect debts on this day.
Because this day is close to China's traditional Spring Festival, the firms tapu direct debt collecting in people's homes.
However, acidity damages the cells of the garlic, allowing the enzyme to cleave the sulfur-containing compound alliin to release reactive thiosulfinates.
These then react with each other and with amino acids found naturally within cells to make pyrroles, clusters of carbon-nitrogen rings.
When four of the pyrrole rings have been joined together, the resulting structure is very like phycobilin, a compound used by algae and some bacteria to capture light for photosynthesis.