Munggo or mung beans are often served on Fridays in Filipino culture because of the influence of Catholic traditions. Fridays are considered a day of abstinence from meat, especially during Lent and other fasting periods. Munggo is a protein-rich dish that is often prepared without meat, making it a suitable option for Fridays when meat consumption is traditionally avoided. This practice reflects the cultural and religious significance of abstaining from meat on certain days among Filipino Catholics.