step 1
Over a medium heat melt the butter in a large saucepan
step 2
When the butter has melted add the large marshmallows to the saucepan
step 3
Melt the marshmallows until smooth and silky. Stir regularly
step 4
In a large mixing bowl pour the rice crispy cereal
step 5
Add the marshmallow mixture and stir
step 6
Tip into a foil baking tray
step 7
Melt the chocolate in a bowl over a saucepan of boiling water
step 8
When melted drizzle the chocolate generously all over the cake and place in the fridge to cool