What kind of sauce or gravy goes very well with steak tartar?

Steak tartare is a dish that is typically enjoyed without any sauce or gravy. The raw beef is seasoned with salt, pepper, and sometimes other ingredients like capers, shallots, and Dijon mustard, and is meant to be enjoyed for its pure, intense flavor.

Adding a sauce could mask the delicate taste of the beef, and it's generally considered to be an unnecessary addition. However, if you're looking for something to complement the dish, here are a few options that can work:

* Aioli: A creamy garlic sauce that provides a pungent, garlicky flavor that complements the richness of the beef.

* Mustard sauce: A simple mustard sauce made with Dijon mustard, olive oil, and vinegar can add a tangy kick to the dish.

* Pickled onions: The tart acidity of pickled onions can cut through the richness of the beef and provide a refreshing contrast.

* Lemon wedges: A squeeze of lemon juice can brighten the flavor of the steak tartare and add a touch of acidity.

Ultimately, the best way to enjoy steak tartare is to savor its natural flavor without the distraction of any additional sauces. However, if you prefer a bit of extra flavor, the options above can be a good starting point.