Preheat oven to 180C/350F (160C/320F fan forced).
Place cooked quiche crust on a tray.
Asparagus - break woody ends off (Note 7). Cut into 3.5cm / 1.5" pieces, separate tips from stems (tips for decorating).
Melt butter in a skillet over medium heat. Add leeks and garlic, saute for 2 minutes or until leeks are translucent, don't let them go golden.
Stir in asparagus stems (don't cook), then remove from stove.
Cool slightly then scatter across base of quiche crust.
Whisk together eggs, cream, dill, salt, pepper in a bowl.
Scatter 2/3 of the salmon across quiche, folding/twisting pieces rather than laying flat.
Top with cheese, pour over egg mixture.
Top with remaining salmon and asparagus tips.
Bake for 40 minutes or until top is light golden and centre is set but still slightly jiggly when you poke it.
Rest for 10 minutes before carefully removing from tin and slicing.