Boil the eggs.
In the meantime get your tuna in olive oil, the anchovies & the capers ready.
Mix the Greek yoghurt w/ the lemon flavoured oil, the olive oil, the mustard & add salt & pepper to taste w/ an egg whip.
Chop the hard-boiled eggs w/ an egg cutter.
Put everything in a blender pot & blend w/ a handheld electric blender until everything is smooth.