Preheat your oven to 325°F.
Add 2 tablespoons olive oil to a heavy pot or Dutch oven and heat over medium heat. Add 1½ pounds onions along with ½ teaspoon of kosher salt, cooking for 15-20 minutes until they become very tender and golden brown.
Transfer the sautéed onions to a separate dish and set aside. In the same Dutch oven, season 2 pounds of cubed beef chuck roast or stew beef with the remaining salt and ½ teaspoon black pepper; cook over medium-high heat for about 5-10 minutes or until browned on all sides.
Stir in the previously cooked onions along with ½ green pepper, ½ diced tomato, minced garlic, sweet Hungarian paprika, dried marjoram, caraway seed, tomato paste, beef broth, dry apple vinegar, and a bay leaf into the pot; bring to a boil.
Place the lid on the pot allowing it to sit askew so steam can escape; then transfer it to your preheated oven. Cook for about 1½ hours or until the beef is tender.
Remove from oven once done cooking and garnish with freshly chopped parsley before serving alongside spaetzle, buttered noodles, or potatoes for an authentic touch.