Parmesan sablés

Method

1. In a food processor, pulse the flour, salt, cayenne pepper and English mustard powder.
2. Add the butter, then pulse until you have a mixture that looks like breadcrumbs. Add the parmesan and 1 teaspoon of cold water, then pulse to form a dough.
3. Shape in to a log, then wrap in cling film and chill for at least 30 minutes or up to 48 hours.
4. Heat the oven to 180°C/ 160°C fan/gas 4. Slice the dough into 5mm rounds and place on a lined baking sheet about 3cm apart (the biscuits will spread a little in the oven.) Brush with the beaten egg, then sprinkle with extra sea salt and poppy seeds. Bake for 12 minutes or until golden.