Gluten-free coconut citrus slice

Ingredients

• 150 g butter
• 3/4 cup sugar
• 1/3 cup honey, plus 1 Tbsp extra to serve (optional)
• 2 cups desiccated coconut
• 200 g gluten-free rice biscuits (we used Arnott's rice cookies), finely crushed but not powdery
• 1 tbsp finely grated citrus zest (eg orange or lemon, lime, mandarin etc)
• Icing
• 50 g butter
• 3 cups icing sugar
• 1/4 cup citrus juice
• 2 tbsp finely grated citrus zest
• 1 lemon, sliced into thin rounds