In this video, you’ll see how to make grilled beef with a Spanish-inspired marinade. The key ingredients here are smoked paprika, sherry vinegar, and mustard. Add a little crushed garlic if you like. (You really should.) This is a great marinade for any thin cut of beef: skirt steak, flank steak, round steak, carne asada. Watch the video, then get the recipe for Chef John’s Grilled Spanish Mustard Beef. Try it sliced thinly against the grain and served on tortillas with cilantro and hot sauce and maybe some sliced avocado. So simple and delicious.