Mung bean (monggo bean)

It's Friday. I cook sauted monggo beans with ampalaya leaves and pork adobo for our lunch. I am obliged to cook food for our lunch early because my daughter wants food for her lunch from home than buying food near their office where she works. She requested viand with vegetables always.

By the way, i am just wondering why most Filipinos cook monggo beans only on the day of Friday. I don't know the reason behind and i asked my neighbors and vegetable vendors but they don't have any clue.
English word of monggo is a mung. The beans are small, ovoid in shape, and color green.