- Wash, dry and peel the potatoes and cut into small cubes. Set aside on kitchen paper. 
 - Cut the base of the asparagus, wash it then cut into pieces keeping the tips. 
 - Finely chop the onion. 
 - In a pan or high-sided frying pan, melt the butter with two tablespoons of olive oil. Gently fry the onion then add the asparagus pieces and cook gently for 5 minutes. 
 - Add the potatoes, stir well and fry for 2 minutes. Pour in the white wine and reduce, stirring gently. 
 - Pour in the vegetable stock a third at a time allowing it to absorb each time. Mid-way through, add the asparagus tips. 
 - Gradually pour in the vegetable stock allowing the potatoes to absorb each time. Mid-way through, add the asparagus tips. 
 - When the potatoes are well-cooked but still firm, add the parmesan. Season with salt and pepper. 
 - Serve immediately. 
 
Tip 
Just before serving, you can add some shavings of Parmesan and a few thin slices of smoked ham.