1.To make anchovy mayonnaise, whiz all the ingredients, except the oils, in a processor to combine. Slowly pour in the oils as the motor is running. Season to taste.
2.Heat olive oil in a heavy-based frying pan, add chilli flakes and tuna and cook for 2-3 minutes on each side, or until just cooked. Remove from the pan and rest before tearing into bite-sized pieces.
3.Toss tuna and all remaining ingredients except the eggs and parmesan together in a large bowl. Season and spoon onto a serving platter then carefully add the eggs and garnish with shavings of parmesan.
4.Serve with anchovy mayonnaise.
Check labels of mayonnaise and worcestershire sauce if eating gluten-free. A 425g can of tuna can be used in place of fresh tuna steaks. Drain and break into large flakes.