Rub the tuna steaks in extra-virgin olive oil and set them aside. Finely chop the sun-dried tomatoes and the pistachios and mix them together in a small bowl.
Add the poppy seeds and the breadcrumbs to the bowl and season well with salt and pepper.
Transfer the mix into a small plate and press the tuna steaks until well coated. If the crust mixture does not adhere properly to the tuna, it means it's either not chopped finely enough or the steaks are too dry.
Drizzle some olive oil in a pan and when hot add the tuna steaks. Sear for about 1 minute on each side and serve immediately.
Notes
If you use frozen tuna steaks, thaw them overnight in the fridge.This dish will go well with a side of fresh salad or grilled vegetables.