Make a saffron infusion by mixing the saffron threads with a small amount of pre-heated stock in a container and allow a few hours for the flavour and colour to infuse out
Heat the stock in a pan on a low heat and have a ladle at the ready
In a separate casserole pan, add the oil and the rice and cook until beginning to toast
Once the rice begins to toast, pour in the wine and cook until it’s absorbed
Add some of the stock and the saffron infusion and stir continuously
Add more stock as it’s absorbed and repeat the process a ladleful at a time
The rice should take 15 minutes to cook
In the meantime, cut the asparagus and julienne the tips
After 15 minutes, the rice should be creamy and yellow due to the infusion
Add the Parmigiano Reggiano and the butter and stir into the risotto
Season the risotto with pepper and white wine vinegar
Serve and garnish with the asparagus tips