To cook the trout on the barbecue, wait for the coals to turn ashy grey, then pop the tin on the grill and follow the recipe, above.
Boil the potatoes in a large pan of salted water for about 15 mins. Drain well in a colander and allow them to steam dry for 5 mins.
To make the dressing: mix the mustard, olive oil and vinegar with some seasoning. Stir in the spring onions, then pour the mixture over the warm potatoes and allow to cool.
To make the smoking mixture, split the tea bags and empty the leaves into a bowl with the sugar and rice. Line a deep roasting tin with foil, tip the smoking mix on top and cover with another piece of foil. Place the tin onto the hob over a medium heat until it starts to smoke a little.
Once you see smoke escaping, put the trout on top with a little bit of seasoning and cover with more foil, trapping the smoke inside. Lower the heat and leave to smoke for 20-22 mins until the trout is cooked – it should flake away from the bone when it is done.
Add the rocket to the potato salad and gently stir to coat in the dressing. Divide between 4 plates and serve with the trout.