Clean and wash the arugula. Peel and chop the onions. Wash and roughly dice the tomatoes. Cut avocados in half, stone, peel and cut into bite-sized pieces.
Mix vinegar, salt, pepper and 1 pinch of sugar. Fold in 3 tablespoons of oil. Mix the vinaigrette with rocket, tomatoes, avocados and onions.
Wash pork fillet, pat dry and cut into 8-10 steaks. Heat 2 tablespoons of oil in a frying pan. Fry the steaks for 2-3 minutes on each side. Then season with salt and pepper.
Season avocado salad and arrange on plates with the steaks. Crumble feta cheese over it. Sprinkle everything with pepper from the mill and serve.