Melt 25g of butter in a heavy-based pan
Heat the stock to a gentle simmer - I tend to do this in the microwave
If you are using shallot, add it to the butter and sweat gently for a couple of minutes
Add the rice and stir till all the grains are coated and the rice starts to turn translucent
Add the wine, all in one go, stirring constantly
Once the mixture is sticky and the wine is absorbed, start to add the stock little by little, stirring until it's absorbed, then adding more.
As the stock is added, check the rice and once it starts to develop a 'bite', add the peas
Continue to add stock until the rice is cooked but still has a little bite
Take the pan off the heat, season with salt and pepper and stir through the grated cheese and the remainder of the butter
Beat the mixture well until the risotto is creamy
Garnish with fresh herbs and serve immediately