Add the butter and spring onions to the pan, and fry for 30 seconds. Pour in the oil, lemon juice and capers and heat for a further 30 seconds. Add the cooked pasta, reserved pasta water ...
Once the butter is a nut-brown colour, add the capers, orange juice and parsley. Remove from the heat. In the meantime, blanch the asparagus in a pan of boiling water until tender. To serve ...