Step 1 of 6
Mince garlic and anchovies together until paste-like.
Step 2 of 6
In a bowl, whisk together garlic-anchovy paste, egg yolk, mustard, and lemon juice.
Step 3 of 6
While whisking constantly, slowly drizzle in olive oil until dressing is thick and creamy.
Step 4 of 6
Stir in half of the Parmesan cheese and season with black pepper.
Step 5 of 6
Toss romaine lettuce with dressing until well coated.
Step 6 of 6
Top with croutons and remaining Parmesan. Serve immediately.