Heat 2 tablespoons of olive oil in a stovetop pressure cooker over medium-high heat. Add the garlic and sauté briefly until fragrant.
Add the beef and cook over high heat, stirring frequently, until it begins to brown. Add the beef bouillon or salt, black pepper, chimichurri, turmeric, annatto, and oregano, and continue stirring until the meat is well coated and lightly browned.
Add the grated onion and chopped bell pepper and sauté, stirring, for a few minutes. Add the water, scraping the bottom of the pot to release any browned bits. Add the corn rounds and bring to a boil.
Close and lock the lid. Give it a quick rinse before closing; the moisture helps create a better seal so the pressure builds faster. Once the cooker reaches full pressure and begins releasing steam and making noise, cook for 20 minutes.
Remove the cooker from the heat. Using a fork, carefully lift the valve to slowly release all the pressure.
Once all the pressure has been released, carefully remove the lid, allowing the steam to escape away from you. Add the sweet potato, russet potatoes, and carrots, stirring to combine.
Secure the lid again and return the cooker to heat until it reaches pressure and begins to make noise. As soon as pressure is reached, remove from the heat.
Using a fork, carefully lift the valve to slowly release all the pressure.
While the stew cooks, heat the remaining 2 tablespoons of olive oil in a large nonstick skillet over medium heat. Add the okra and sauté for 3 to 5 minutes until lightly tender.
Add the lemon juice, reduce the heat to medium, season with ½ teaspoon salt and ¼ teaspoon black pepper, and stir well.
Carefully remove the lid, allowing the steam to escape away from you. Add the sautéed okra, green onions, and parsley. Taste and adjust seasoning to taste. Serve hot.