Step 1

Drain the tuna, reserving 1 tablespoon of the oil, and flake to separate.

Step 2

In a heavy-based saucepan, heat the tuna oil over medium heat and cook the onion for 1-2 minutes or until softened.

Step 3

Mix the fish stock with an equal amount (375ml) of water. Add the rice to the onions and cook for 2-3 minutes, stirring to coat the grains well. Add the wine and allow alcohol to evaporate.

Step 4

Once the wine has been absorbed, add the diluted stock a ladleful at a time until all liquid is absorbed - this will take about 20 minutes.

Step 5

When rice is cooked, stir in tuna, parmesan and lemon rind and juice, then season to taste. Serve on a bed of rocket and garnish with extra zest.