Set your oven rack to the lower-middle position and heat the oven to 300 degrees.
1 tablespoon kosher salt, 1 teaspoon garlic powder, ½ teaspoon paprika, ½ teaspoon dried oregano or dried rosemary, ¼ teaspoon ground black pepper
In a small bowl, use a spoon to stir together the salt, garlic powder, paprika, dried oregano and/or rosemary, and pepper.
1 ½ pounds beef stew meat, cut into 1- to 1 ½-inch pieces
Place the beef in a medium bowl and sprinkle it with half of the salt mixture; set the rest of the salt mixture aside for later. Use the spoon to stir the beef until it’s evenly coated with the seasonings.
2 tablespoons olive oil, 1 small yellow onion, peeled and chopped fine
In a Dutch oven, heat the oil over medium heat until it’s shimmering, 2 to 3 minutes. Add the chopped onion and cook, stirring occasionally with a wooden spoon, until lightly browned, 6 to 8 minutes.
3 tablespoons all-purpose flour, 1 tablespoon tomato paste
Stir in the flour, tomato paste, and remaining salt mixture to the onions and cook until beginning to brown, 1 to 2 minutes.
4 cups water
Add the water and use the wooden spoon to scrape the browned bits off of the bottom of the pot. Increase the heat to medium-high and bring to a boil (big bubbles will vigorously break all over the surface).
3 medium carrots, peeled and cut crosswise into 1-inch pieces, 1 turnip, peeled and cut into 1-inch chunks
Add the carrots, turnip, and seasoned beef and bring to a simmer (small bubbles will gently break all over the surface). Turn off the stove.
Place the lid on the Dutch oven and transfer it to the preheated oven (this step is best done by an adult; the pot will be heavy and hot). Cook, covered, until the beef and vegetables are tender, about 2 hours.
1 cup frozen pearl onions
Use oven mitts to remove the lid and stir in the pearl onions (this step is best done by an adult; the lid and pot will be very hot). Continue to cook in the oven, uncovered, until the onions are tender and the mixture reduces slightly, about 30 minutes.
½ cup frozen peas
Use oven mitts to remove the Dutch oven from the oven and set on the stovetop (this step is best done by an adult; the pot will be heavy and very hot). Stir in the peas (if using) and let the stew sit for 5 minutes. Season to taste with extra salt, ladle into bowls, and serve.