Wash and soak the mung beans in a bowl of water overnight. Blend the beans with a splash of water and a pinch of salt until an even paste is formed. Heat oil in a large saucepan and, when hot, drop spoonfuls of the mixture into the oil and try until golden and cooked through. Place on a paper towel to drain the excess oil.
Cook prawns, onions, and dried shrimp in a little bit of oil. Reserve some of the shrimp mixture to top your dumplings. Blend the remainder of the shrimp mixture with hot peppers, salt, oil, and lemon juice to create a prawn sauce.
Use the prawn sauce as your base, place the mung dumpling on the sauce, and top with the reserved shrimp mixture.