Try this Quiche Lorraine recipe, or contribute your own.
Ingredient quantities outline proportions, but they hide the physical reality of moisture management in pastry work. Butter must remain cold during incorporation; cutting it into flour until the texture resembles coarse breadcrumbs ensures fat pockets melt during baking to create flaky layers. Resting the dough for 30 minutes relaxes the gluten network, preventing the crust from shrinking away from the pan edges.
Hot bacon and onions must cool slightly before contacting the egg mixture, or residual heat will prematurely curdle the proteins. Frying onions thoroughly removes water content that would otherwise weep into the custard and ruin the set. Blind baking the 23cm flan pan for 8 minutes covered with foil, followed by 5 uncovered minutes, creates a moisture barrier so the liquid filling never produces a soggy bottom.
Custards demand moderate heat to achieve a smooth, velvet texture without developing a spongy, overcooked perimeter. Operating the oven at 180 degrees Celsius for the final 30 minutes gently coagulates the eggs and milk. Whisking eggs thoroughly incorporates air, but letting the batter rest briefly allows foam to subside so the final slice cuts cleanly.