Butter a 24cm x 11cm loaf tin or the equivalent and line with cling film.
In a small pan gently melt the butter, sugar, syrup, cocoa powder and chocolate. Remove from the heat and allow to cool.
Now add the maltesers and marshmallows, mix well and spoon into the loaf tin. Cover with the excess cling film and refrigerate for 3 hours.
Once set remove from the loaf tin and place onto a serving plate.
For the topping, place a small heat-proof bowl over a pan of gently simmering water. Place the chocolate in the bowl and gently melt, once melted pour over the rocky road.
Place in the fridge for 20 minutes to set the chocolate, to serve cut the rocky road into slices. Enjoy!