Cut tofu into 1/2" cubes. Cut mushrooms in half. Put 6 c cold water in a large pot & bring to a rapid boil. Add the A SEASONINGS, reduce heat to medium low & simmer for 15 minutes. Remove any solid pieces of galanga, cilantro, lemon grass or kaffir that there are. Add the tofu & mushrooms & simmer another 3 minutes. Mix in the B SEASONINGS & heat through. Place soup in a tureen & garnish. To make the soup less hot use milder chilies.