Sounds good; you could try using chestnut mushrooms instead of normal mushrooms as they tend to have a better flavour.
You could also add dried shittake mushrooms, prepared in the same way as the dried porcini mushrooms.
If you wanted to go to extremes, one of the stalls in the market (the one nearest to the market square Starbucks, next to the stall selling lots of old-style sweets) sells really nice looking wild mushrooms as well. AFAIR they even sell fresh shittake mushrooms, but they are often improved by being dried first.
The milk would be added to give a certain amount of creamyness to the sauce; you can try using a small amount of double cream instead.
I'd also think about using shallots in addition to the onion; they are a pain to prepare (although you can get "Really lazy shallots" now which are pretty good), but they definately add a nice flavour.
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You could also add dried shittake mushrooms, prepared in the same way as the dried porcini mushrooms.
If you wanted to go to extremes, one of the stalls in the market (the one nearest to the market square Starbucks, next to the stall selling lots of old-style sweets) sells really nice looking wild mushrooms as well. AFAIR they even sell fresh shittake mushrooms, but they are often improved by being dried first.
The milk would be added to give a certain amount of creamyness to the sauce; you can try using a small amount of double cream instead.
I'd also think about using shallots in addition to the onion; they are a pain to prepare (although you can get "Really lazy shallots" now which are pretty good), but they definately add a nice flavour.