Steak Salad with Romesco Dressing - Fresh-Pressed Olive Oil

Ingredients

• 6 tablespoons extra virgin olive oil, divided use, plus more for drizzling
• 4 tablespoons white wine or sherry vinegar
• 1 tablespoon Spanish smoked paprika (pimentón)
• 5 cloves garlic, minced
• 1 teaspoon dried oregano
• 2 pounds flank steak
• 2 red onions, peeled and thickly sliced
• 3 red bell peppers, stemmed, seeded, and sliced into eighths
• Coarse salt (kosher or sea) and freshly ground black pepper
• Vegetable oil for the grill or grill pan
• 1 head red leaf lettuce, washed, dried, and torn into pieces
• 1 head romaine lettuce, washed, dried, and torn into pieces