- Portion size 23 servings
In large bowl, sift together flour, cocoa, sugar and salt. Using pastry blender or 2 knives, cut in butter and shortening until mixture resembles fine crumbs with a few larger pieces.
In liquid measure, whisk together egg yolk and vinegar. Add enough ice water to make 1/3 cup (75 mL). Drizzle over flour mixture; using fork, briskly stir until dough holds together. Gather dough and press into disc. Wrap in plastic wrap and refrigerate until chilled, about 30 minutes. (Make-ahead: Refrigerate for up to 3 days.)