First, make the chocolate sauce by heating all the sauce ingredients (apart from the butter) in a medium-sized pan. Let the mixture come to the boil and then continue to cook for around five minutes. Remove from the heat and then whisk in the butter until it has melted. Set to one side to cool (you should end up with a fairly thick sauce of a pouring consistency).
Whip the cream until nice and thick and then place in the fridge until it is required.
To assemble the trifle, start by placing half of the cake or brownies in a large bowl (break them into smaller pieces and try to get a fairly even layer which pretty much covers the whole of the bottom of the bowl). Next, pour half of the chocolate sauce evenly over the cake. Then, place half of the strawberries on top, followed by half of the cream.
Follow the above a second time with the remaining ingredients, and then sprinkle with chocolate vermicelli to give it a real trifle feel. Place in the fridge until ready to eat. Enjoy!