Easy Famous La Scala Chopped Salad (20-Minute Copycat)

Ingredients

• 1/3 cup (80 ml) extra-virgin olive oil
• 3 tablespoons red wine vinegar
• 1 teaspoon Dijon mustard or 1/2 teaspoon dry mustard
• 1 small garlic clove, finely grated
• 1/3 cup (30 g) finely grated Pecorino Romano
• 1/2 teaspoon kosher salt, plus more to taste
• 1/4 teaspoon black pepper
• 1 small head iceberg lettuce, finely chopped, about 5 cups
• 1 small romaine heart, finely chopped, about 3 cups
• 1 can (15 oz or 425 g) chickpeas, drained and rinsed
• 1/4 teaspoon dried oregano
• Pinch of red pepper flakes, optional
• 4 oz (115 g) Italian dry salami, cut into thin matchsticks
• 1 1/2 cups (170 g) shredded low-moisture mozzarella
• 1 kalamata olive for garnish, optional