Looks impressive, tastes even better but takes no time at all to make!
Preheat the oven to 200C or 180C for fan assisted ovens, roll out the puff pastry, line a tart tin with baking paper and using your hands, fit the pastry inside the tin.
Bring a pan of water to the boil and add the asparagus for 3 minutes, drain and chop in to small segments.
In a mixing bowl, combine the eggs, cream, mustard, chopped asparagus and cheese and combine. Add salt and pepper to taste.
Tip the mixture in to the pastry and place the halved spring onions on top. Bake for 25 minutes or until golden brown.