Iced party rings

Method

1. Put the butter, flour, cornflour and salt in a food processor and pulse until the mixture resembles fine breadcrumbs. Add the caster sugar and pulse to combine. Beat the eggs with the vanilla bean paste in a small jug, then pour into the food processor and pulse until the mixture just starts to come together to form a dough. Turn out and use your hands to gently bring the mixture together into a dough. Shape into a disc, wrap well and chill for 1 hour.
2. Heat the oven to 180°C/160°C fan/gas 4. Divide the dough in half and  roll out one piece on a lightly floured worksurface to the thickness of a £1 coin. Cut out as many 7cm rounds as possible, then use the 2cm cutter to cut a hole in the centre of each one to form a ring. Repeat with the remaining dough, re-rolling the trimmings until all the dough has been used up. Transfer the rings to the prepared baking sheets, spacing them well apart, then chill for 30 minutes.
3. Bake the biscuits for 10-12 minutes until lightly golden. Cool on the baking sheets while you make your icings.
4. Mix all the ingredients for each icing in separate bowls to make a plain white icing and pastel coloured orange, yellow, green and pink icings. They should be smooth and relatively thick, so add the juice gradually and practise dipping a shop-bought biscuit into the icings to see if the consistency is right. Add a little more citrus juice or icing sugar to adjust the consistency.
5. Dip the top of each cooled biscuit ring in the pastel coloured icing of your choice, then put back on the baking sheets. Transfer the white icing to the prepared piping bag. Pipe parallel lines across each iced biscuit, then drag a cocktail stick down through the lines to feather the white icing. Leave to set for 1 hour, then serve with a nice cup of tea.