Heat the extra virgin olive oil in a large cast-iron or stainless steel skillet over medium-high heat until shimmering.
Pat the diced beef dry with a paper towel to ensure a good sear, then season with half of the sea salt and black pepper.
Add the beef to the hot skillet in a single layer, allowing it to sear undisturbed for 2 minutes to develop a brown crust.
Toss the beef and continue cooking for another 2-3 minutes until browned on all sides, then remove the beef from the pan and set aside.
In the same skillet, add the diced onion, bell pepper, and zucchini, sautéing for 4-5 minutes until the vegetables are tender but still vibrant.
Lower the heat to medium and stir in the minced garlic, rosemary, and thyme, cooking for 60 seconds until the herbs are highly aromatic.
Return the seared beef and any resting juices back into the skillet, tossing thoroughly to coat the meat and vegetables in the herb oil.
Season with the remaining sea salt and black pepper, then serve immediately while hot.