This is an interesting starter. Devil's on Horseback is a lot cheaper to make than Angels on Horseback.
Pre-heat oven to 400F.
Stuff each prune with a teaspoon mango chutney.
Cut each rasher in half, wrap bacon around prune.
Place a cocktail stick in them prevent unraveling.
Place on a baking sheet.
Keep them packed up tight so that they don't unravel.
Bake for about 8 minutes.
Slather toast with butter.
Arrange two devils on each piece and garnish the dish with watercress.