Add all the ingredients for the vinaigrette to a small bowl and whisk to combine. Season with salt and pepper as needed Chop.
In a large bowl, combine lettuce, radicchio, red onion, tomatoes, beans, mozzarella, salami, and yellow pepper. Season with salt and black pepper to taste and toss together well.
Drizzle ¾ of the vinaigrette over the salad and toss again to coat all the ingredients in the oil. Taste and add more vinaigrette as needed, plus salt and pepper. Serve.