Tahong Umpoco Caldo is a very simple way of cooking tahong simply by steaming.
a tsp cooking oil
1 medium-sized onion, chopped
one kilo mussels (tahong), shells cleaned
In a large sauce pan over medium heat, saute garlic and onion in oil. When the onion becomes translucent, add the tahong. Stir occasionally for about two minutes. Bring to a boil stirring occasionally. Simmer until the tahong shells have all opened. Do not overcook.