This is a fabulous combination, especially as the beef is on the rare side. This can be done very nicely with beef or tuna. Quite common. As a non-beef-eater, you may just not be familiar with this quite normal preparation
Still, preparing it separately wouldn't hurt.
Cheers.
Indeed. Pairs very well with arugula, I think. Beef also pairs well in a salad with another vegetarian favorite... lentils... though, anticipating
brp's thoughts on that, they do contain carbs.