Season the ground beef with the spices and mix well. Heat oil in a pan, sauté the garlic until fragrant, then add the beef and stir-fry quickly. Add black pepper, then turn off the heat. Dice the onion and finely chop the cilantro.

For the sauce: Whisk the egg yolk with the vinaigrette and garlic powder until the sauce turns pale. Add black pepper. The sauce should be tangy and slightly sweet. To assemble, use flour tortillas, add the beef in the center, sprinkle with cilantro, onion, and sauce. If you like it spicy, add a little hot sauce.