Pour 75ml boiling water over the tea bag and add the chile de arbol and allspice. Let the tea infuse for 2-3 minutes before removing the tea bag and allowing the mixture to cool, but leaving in the spices.
When cool, add the prunes and brandy and leave to marinate in the fridge for at least a few hours, but preferably overnight.
Pre-heat the oven to 200°C or use a hot grill. Remove the prunes from the marinade and carefully wrap in enough bacon to cover the prune entirely.
Bake for about 10 minutes, basting occasionally with the marinade, or alternatively grill for 5 minutes on each side, until the bacon is crispy and cooked through. And watch out, the prunes will be hot!