Drain the vegetables well, then cut them into pieces.

Do the same with the beef.

In a large bowl, finely slice the shallot and chives. Add the red wine vinegar, salt, and pepper. Mix well, then add the sunflower oil.

Add the beef and vegetables, and toss with the vinaigrette. Let rest for 30 minutes at room temperature.

Serve as an appetizer, for example.