Ok I make mine like this:

1 large toblerone
150ml thickened cream
1 tbl spoon brandy, or kaluha or similar (or skip the grog if you want)

Melt the chocolate and cream in the microwave... about 1-2 minutes,
Mix until smooth and combined.
Add grog if you want.

Serve with strawberries, or lollies (bananas are good) or sponge finger biscuits, or whatever you fancy.