• Line an 8x8-inch tin with baking paper.
• Crush the Party Ring biscuits into fine crumbs using a food processor or blender.
• Place the crumbs into a large bowl with the melted butter and 120ml of condensed milk. Save the rest of the tin for the topping.
• Mix well to make a wet dough-like mixture then press it into your lined tin.

Topping:

• Break the white chocolate into pieces and place it into a saucepan with the rest of the condensed milk.
• Put the pan over low heat and stir gently until the chocolate has melted and the mixture has become thick and glossy.
• Place 2 tablespoons of the mixture into a separate bowl and use the food colouring to make it pink.
• Spread the white chocolate topping over the biscuit base in the tin then add spoonfuls of the pink mixture on top. Use a toothpick to swirl the two colours together into a marbled pattern.
• Top with mini Party Rings then place in the fridge for 4 hours to set.