Swordfish Schnitzel with Radicchio Salad

Name: Swordfish Schnitzel with Radicchio Salad
Ingredients: 1/2 red onion, thinly sliced; 2 8-ounce swordfish steaks (1 to 1 1/2 inches thick); 1/4 cup all-purpose flour; 2 large eggs, lightly beaten; 3/4 cup breadcrumbs; Kosher salt and freshly ground pepper; 4 slices thick-cut bacon; 3 tablespoons extra-virgin olive oil, plus more as needed; 1 head radicchio, torn into large pieces; 1 small head butter lettuce, torn; 2 tablespoons red wine vinegar; 1 tablespoon spicy brown or Dijon mustard