Heat oil in a large pan over medium-high heat. Add the beef strips and fry for 3-5 minutes, stirring occasionally, until browned. Add the chopped onion and pressed garlic, cook for 2 minutes until fragrant.
Add the 3 chopped bell peppers (red, green, and yellow) and chopped beefsteak tomato. Stir in 5 tablespoons tomato ketchup and season with oregano, basil, salt, and pepper to taste. Cook over medium heat for 5-7 minutes until the peppers begin to soften.
Stir in the crème fraîche with garlic and chopped parsley. Cook for 1-2 minutes until heated through, then taste and adjust seasoning with salt and pepper as needed.