Wild Garlic, Mushroom, and Brie Cheese Quiche

For the dough, combine the flour, salt, and sugar in a food processor. Mix with a few short pulses.

Add the diced cold butter and process until it resembles wet sand.

Whisk one egg with 1 tablespoon of water. With the machine running, drizzle it into the dough. If it's too dry, add a little more water; if too wet, a little flour. Form into a disc, wrap in foil, and chill in the refrigerator for 30 minutes.