(Optional) Blind bake the crust if using. Fit the crust to an 10 inch tart pan, deep pie pan or the equivalent. Poke holes in the bottom, line with parchment and pie weights, then bake at 375 for 15 minutes. Remove the parchment and bake about another 10 minutes until bottom is dry and just starting to brown. Remove from the oven. Crust can be filled warm or cooled.
Beat together eggs, half & half, dill, salt and pepper. Set aside.
Sprinkle onion, flaked salmon, asparagus and half of the cheese evenly into baked crust (or into tart or pie pan if not using a crust).
Pour egg mixture over quiche filling and top with remaining cheese.
Bake at 350 F for Bake at 350 degrees for 35-45 minutes until slightly golden and puffy and knife inserted off center comes out clean. A deep dish quiche may take up to 15 minutes longer.
I am not a health professional and nutrition data is calculated programatically. Accuracy may vary with product selection, calculator accuracy, etc. Consult a professional for the best information.