Salmon Prawn Risotto

Seafood
Italian
Fish
Salmon Prawn Risotto
butter50g/2oz
onion1 finely chopped
rice150g
white wine125ml
vegetable stock1 litre hot
lemonThe juice and zest of one
King Prawns240g large
salmon150g
asparagus100g tips blanched briefly in boiling water
black pepperground
Parmesan50g shavings