Step 1

Heat the oven to 160°C. Dry the steak, season with salt and pepper. Peel the onion, cut it in half, then cut each half into 4 more pieces, cut into petals.

Step 2

Heat a grill pan well, add olive oil, fry the steak for 2-3 minutes until browned, then flip and cook for another 2-3 minutes. Remove the skillet from the heat, transfer the steak to a ceramic mold and cook in the oven for 4-5 minutes, depending on desired degree of doneness. Remove, cover and let rest. Slice the beef into very thin strips before serving.

Step 3

Return the grill pan to the fire and fry the onion in the remaining oil until soft.

Step 4

Prepare the dressing with the remaining olive oil, lemon juice, salt and sugar. Cut the tomatoes in half. Mix most of the dressing with the salad mixture and arrange the salad on serving plates. Place onions, sliced beef and tomato halves on the same plates. Drizzle with the remaining dressing and serve immediately.