Mum's mushroom pate

I've been meaning to post this for ages!  It is very good, makes far too much but it freezes well.

375 g mushrooms, sliced
3 tsp finely chopped onions (I used 1 small onion)
250 g butter, softened
50 g fresh breadcrumbs (2 slices!)
Lots of grated nutmeg
1 tbs chopped parsley
200 g reduced-fat cream cheese
2 tsp lemon juice (10 ml)
Scant tbs soya sauce (15 ml)

Melt 225 g of the butter, add onion and soften for about 10 minutes.  Add mushrooms, turn up the heat and fry briefly for a few minutes.  Stir in breadcrumbs and allow to cool.  Puree in food processor and then add the rest of the ingredients and work until smooth.