- STEP 1
Heat oven to 200C/180C fan/gas 6. Roll out pastry and line a 25cm tart tin. Line the case with greaseproof paper and fill with baking beans. Bake for 15 mins, then remove paper and beans and cook for 5 mins more. Trim off excess pastry. Reduce oven to 190C/170C fan/gas 5.
- STEP 2
Melt the butter in a non-stick pan, stir in the flour and cook for 1 min. Gradually add the milk, stirring all the time until the sauce is smooth and glossy. Add nutmeg, chilli and salt and leave to cool slightly.
- STEP 3
Flake up the crabmeat and add to the sauce. Blanch the asparagus for 3 mins, drain well and cool under cold running water. Pat dry with kitchen paper and scatter over the pastry case.
- STEP 4
Stir the egg yolks into the sauce. Whisk the whites until stiff, then fold into the sauce in 3 batches. Spoon into the tart case and sprinkle with Parmesan. Bake for 30-35 mins until puffed and golden.