Toss the kale, radicchio, apple, pecans, and Gouda in a large bowl. Pour the red wine vinegar in a small bowl and slowly add the olive oil in a steady stream, whisking until combined. Season with salt and pepper to taste.
Drizzle the salad with enough vinaigrette to evenly coat (you may not need it all), toss gently, and sprinkle a few extra pecans and Gouda shavings over the top. Serve immediately.