For the salad you need to cook the new potatoes and green beans and refresh in iced water, after this cut the bean into 3 pieces and cut the new potatoes into quarters. Cut the cherry tomatoes in half and the olives, half deseed the cucumber then cut in slices, put all this in a bowl with the anchovies.
Put a griddle pan on the stove; bring the water and vinegar to the boil. Season the tuna and put in the pan, cook on each side for 2 to 3 mins depending on thickness of the steak.
Whilst the tuna is cooking whisk the water and vinegar to create a whirlpool and gently break the egg into the middle - cook for 4 mins.
Drizzle a little olive oil onto the salad and then squeeze the juice of a ¼ of the lemon onto the salad, add a little salt and pepper.
To dress the plate put the salad into the middle of the plate, lay the tuna steak atop of the salad and the duck egg on top the tuna, finely grind a little pepper over the egg and drizzle on a little more olive oil.