Special equipment: 6 (4-inch diameter) tartlet pans with removable bottoms
Grease 6 (4-inch) individual tartlet pans with removable bottoms with butter and place on a baking sheet.
Place the flour and salt in food processor and pulse to combine. Add the chilled butter and process to a coarse meal. With the machine running, add 5 tablespoons of water in a steady stream until the mixture forms a dough. Add additional water, 1 tablespoon at a time, if the dough is too dry.
Divide the dough into 6 equal balls and press into the bottom and sides of the prepared tartlet pans. Refrigerate the crusts for 15 minutes.
Preheat the oven to 425 degrees F. Line the crusts with foil and fill with pie weights (or dried beans). Bake for 15 minutes. Cool completely (can be made 1 day ahead).
Mix the chorizo and remaining ingredients. Pour into the prepared crusts, dividing equally. Bake until the quiches are puffed and cooked through, or when a knife inserted into center of the quiches comes out clean, about 45 minutes. Cool slightly. Serve warm or at room temperature.
This recipe will also work in one 9-inch tart pan or glass pie dish.