Preheat the oven to 425F, and lightly grease 2-3 baking sheets. Sift flour, baking powder and curry into bowl and rub in butter and Parmesan
In another bowl, beat together the egg yolk, milk, salt, a pinch of cayenne and Woeber’s Horseradish Mustard or Woeber’s Sandwich Pals Jalapeño Mustard, then stir into flour mixture with a knife. Knead to smooth dough.
Turn onto a floured surface and roll out to 1/4 inch thickness. Cut into rounds with a biscuit cutter, place on the sheets and glaze the top of each biscuit with beaten egg white. Bake for 10 minutes. Cool on wire rack