Dust the aubergine slices with some seasoning.
Heat 2 tbsp of the avo oil in a large frying pan until shimmering.
Add the aubergine to the pan and fry for a few mins on each side until collapsing and soft, then set aside.
Turn up the heat, season the steak, then add to the pan and fry for 2 mins on eachside for rare (longer if you want it medium).
Set aside to rest for 5 mins, then slice.
Blitz the remaining avo oil in a blender or small food processor with the rest of the dressing ingredients and a splash of water.
When ready to serve, mix half the dressing with the lettuce, then tip onto a plate.
Top with the crispy aubergine and steak and drizzle over the remaining dressing.
Scatter over the remaining herbs and serve.