Preparation time: 10 minutes•
Cooking time: 25 minutes
Serves: 4 people
Lay the steaks out at on a large dish and press the crushed peppercorns into them. Drizzle with a little olive oil and balsamic vinegar and set aside, covered, for 1 to 2 hours at room temperature.
Meanwhile, to make the butter, drizzle a little olive oil into a large pan set over a high heat. Add the mushrooms and garlic, season with salt and cook for 2 to 3 minutes, until the mushrooms have caramelised. Remove from heat and set aside to cool.
Beat the butter in a medium sized bowl with a spatula until softened, then mix in the port, cooled mushrooms and parsley. Combine thoroughly and check the seasoning. Roll the butter into a sausage shape, wrap it tightly in cling film and put in the fridge to use later.
Preheat the barbecue to medium or griddle pan to smoking hot. When the coals are lightly coated with ash and are a medium heat, oil the grill grates or the ridges of the pan, then add the steak. Try not to move the meat around too much while it's on the grill, otherwise you wont get a good sear. Just turn it once or twice.
Remove the steak from the grill and let it rest for at least 5 minutes. Just before serving, spread a pat of the wild mushroom and port butter on top of each piece of beef. Serve with some dressed rocket leaves.