Preheat your oven to 350F - 180C and line two baking sheets with baking paper.

Sift the flour with baking soda and salt.

Combine the butter and sugar in a bowl and mix until creamy, at least 3 minutes.

Stir in the orange zest, lemon zest and egg and mix well.

Add the milk and lemon juice then fold in the flour.

Spoon the batter into a pastry bag fitted with a round nozzle then pipe small cookies on your prepared baking sheets. Decorate each cookie with orange peel.

Bake in the oven for 15-20 minutes or until the edges begin to turn golden brown.

Let them cool in the pan then store in an airtight container.