1. Heat the vegetable oil in a large soup pot over medium-high heat.
2. Add the cubed beef and sear until browned on all sides, about 5-7 minutes. Remove the beef from the pot and set it aside.
3. In the same pot, add the chopped onion and minced garlic. Sauté for 2-3 minutes until the onions become translucent.
4. Add the carrots, celery, potatoes, and leek to the pot. Cook for another 5 minutes, stirring occasionally.
5. Return the seared beef to the pot and add the diced tomatoes, beef stock, dried thyme, dried rosemary, salt, soy sauce, and black pepper. Stir well to combine.
6. Bring the soup to a boil, then reduce the heat to low, cover, and simmer for about 45 minutes to 1 hour, or until the beef is tender and the vegetables are cooked through.
7. About 15 minutes before serving, add the green beans, peas, and sweetcorn. Continue to simmer until the vegetables are tender.
8. Taste and adjust the seasoning, adding more salt and pepper if needed.
9. Serve the hearty beef and vegetable soup hot, garnished with fresh herbs if desired. Enjoy!

This comforting beef and vegetable soup is not only delicious but also packed with essential nutrients to keep you energized and satisfied. It’s a wholesome meal that your family will love, and it’s perfect for chilly days or any time you crave a warm, nourishing dish.