Add 1 tablespoon olive oil to a large pot over medium-high heat. Pat the beef with paper towels, season with salt and pepper, and add half of the beef to the pot.: The aroma of hot olive oil meeting meat is one of the first signals that flavor is happening. You should hear a clear sizzle when the meat hits the pan, and within a minute the edges will begin to brown and caramelize, releasing a nutty scent. Browning creates the Maillard reaction which deepens the final broth in ways that boiling alone cannot. If the sizzle sounds weak, the pan is not hot enough, and the meat may steam instead of brown. Avoid crowding the pot, because too many pieces will lower the pan temperature and prevent good color development.
Brown for approximately 4 minutes, flipping halfway. Move to a plate, pour in 1 more tablespoon of olive oil to the pot, and continue with the other half of the beef.: As you flip, look for a consistent golden brown crust, and notice the caramel scent that intensifies when the surface sugars darken. Transferring the browned pieces keeps them from overcooking while you finish the rest. The brief rest on a plate protects juiciness until the simmering stage. A common mistake is to leave the meat in too long in one spot which can lead to burning rather than even browning.
Add more oil to the pot if needed, then add onions, carrots, and celery, and sauté for a few minutes. Add garlic and sauté for 1 minute longer.: Sautéing the aromatic vegetables softens their edges and converts raw sharpness into sweet, savory depth, releasing a fragrant, slightly sweet scent. The onions should become translucent and start to show soft golden edges, while the carrots and celery soften and release their vegetal perfume. Add minced garlic later because it browns quickly and can turn bitter if overcooked. Stir frequently to avoid sticking, and maintain medium heat so the vegetables sweat rather than brown too fast.
Pour in broth, tomatoes, browned beef, basil, oregano, thyme, and season with salt and pepper. Bring to a boil, then reduce heat to low, cover, and simmer, stirring once or twice throughout, for 30 minutes.: When the liquid meets the hot pot, you will see steam rise and hear a gentle bubbling, and the aroma will evolve into a deep, rounded scent. Bringing the mixture to a boil initially helps the flavors marry, then lowering to a slow simmer ensures gentle collagen breakdown in the beef , which yields tender pieces rather than tough ones. Stir occasionally so the bottom does not catch. Avoid a rapid, rolling boil at low heat, because too vigorous a boil can make the meat tough and the broth cloudy.
Add potatoes then continue to simmer, covered, 15-20 minutes. Stir in green beans and simmer 15 minutes longer, or until all of the veggies and beef are tender.: Adding the cubed potatoes at this point allows them to cook through and slightly thicken the broth as their starches release. You should notice the soup thicken a touch and the potato cubes yield to a fork when done. Introducing the fresh green beans later keeps them vibrant and slightly crisp. A common mistake is adding all vegetables at once, which can lead to overcooked beans or undercooked potatoes, so sequence matters for ideal texture balance.
Add corn and peas and simmer until heated, approximately 5 minutes. Mix in parsley and serve warm.: At this final stage the scent shifts toward bright sweetness as the corn and peas come up to temperature, and the surface will show gentle, even movement rather than a hard boil. The peas and corn should remain distinct and tender, offering small pops of sweetness against the savory broth. Stirring in fresh parsley at the end refreshes the aroma and adds a green contrast on the palate. Overcooking here will lead to soft, indistinct vegetables, so keep a close eye and remove from heat promptly when heated through.