snip
The 'ny' character isn't much to go with either, my initial reaction was
milk as that sounds similar. So if you're following my hypothesis - you'd
end up with Mountain Milk : )

I wrote the Chinese word for 'milk' down on paper & low & behold... it did
look a little like 73 but it has another character attached to it on the
left hand side. This character signifies 'female/woman'. Add this together &
it becomes 'milk'. Is your mystery ingredient 'milk'? is it for a dessert or
a dish that uses milk? bearing in mind, the word for soya milk is 'Dou
Jiang' & the word for cow's milk is 'Niu Nai'. I can't figure out what 'San
Nai' is unless 'San' is totally wrong.

DC.