Best Ever Lemon Slice

Now to use up the other half of your lemon/orange icing. Unbelievably simple and delicious; you don't even need to switch the oven on for this one.
You need;- Half a cup of condensed milk, 125g butter, 250g packet of sweet biscuits - 'home brand' or the cheapest you can find, 1 cup desiccated coconut, zest of two lemons.
You;- heat the condensed milk and the butter in a saucepan until butter melts. Crush the packet of biscuits in a food processor; or just in a bag using a rolling pin. Combine the biscuit crumbs with the coconut and lemon zest in a large bowl. Simply pour the condensed milk mix in and stir until well combined. Press firmly into a square slice dish (approx 7 inches/18 cm sq) Refridgerate until cool. Spread your icing over the top. Return to fridge for at least 3 hours before slicing. (If you are making a new batch of icing for this recipe, just cream 250g room temp cream cheese and 90g soft butter with electric beaters. Add 1 cup sifted icing sugar, 1 tablespoon lemon juice and zest of 1 lemon).