In a small bowl, combine the diced tomatoes, red onion, cilantro, lime juice, and jalapeno to create the fresh salsa.
Let the salsa sit for 10 minutes at room temperature to allow the citrus to soften the onion and the flavors to develop.
Heat the olive oil in a large skillet over medium-high heat until shimmering.
Add the ground beef to the skillet, breaking it into small crumbles with a wooden spoon as it browns.
Sprinkle the sea salt, black pepper, chili powder, cumin, and garlic powder over the beef, stirring well to coat every piece.
Sauté until the beef is fully browned and slightly crispy on the edges, which should take roughly 6 minutes.
Warm the corn tortillas in a separate clean skillet over medium heat for 30 seconds per side until soft and toasted.
Assemble the tacos by filling each warm tortilla with the seasoned beef and topping with a generous spoonful of the vibrant salsa.