Step 1

Start by placing the fresh green leaves in the bottom of 2 big wide bowls.

Step 2

Divide the tuna between the 2 bowls, then add all the other ingredients (apart from the walnuts and onions) next to each other in little piles.

Step 3

Scatter the onion over the tuna and the walnuts over all the ingredients in the bowls.

Step 4

Drizzle over the olive oil and balsamic glaze.

Step 5

Serve with the toasted bread and mayonnaise (if you like).