1 cup olive oil
3 tablespoons red wine vinegar
3 tablespoons grated Parmesan cheese
2 tablespoons lemon juice
2 tablespoons finely chopped garlic
2 tablespoons dried oregano, or to taste
1 1/2 teaspoons dried basil
1 teaspoon salt, or to taste
freshly ground black pepper to taste
2 heads romaine lettuce, chopped
2 large tomatoes, cut into wedges
1 large cucumber, cut into matchsticks
1 red onion, sliced
1 cup black olives
1/2 pound feta cheese, crumbled