Ingredients

For the croutons:

• 1/3 medium loaf sourdough boule or ciabatta bread (about 5 ounces)
• 2 cloves garlic
• 3 tablespoons extra-virgin olive oil
• 2 tablespoons grated Parmesan cheese
• Kosher salt
• Freshly ground black pepper

For the dressing and assembly:

• 1 medium lemon
• 4 anchovy fillets packed in oil, drained
• 2 large egg yolks, preferably pasteurized
• 1 clove garlic
• 1 teaspoon Worcestershire sauce
• 3/4 teaspoon Dijon mustard
• 1/2 teaspoon freshly ground black pepper, plus more as needed
• 1/2 cup extra-virgin olive oil
• Kosher salt
• 1 ounce Parmesan cheese (about 2/3 cup finely grated or 1/2 cup store-bought grated), divided
• 2 medium romaine lettuce hearts (about 8 ounces total)

Make the croutons:

1. Arrange a rack in the middle of the oven and heat the oven to 350ºF.
2. Cut 1/3 medium loaf sourdough or ciabatta bread into 1-inch-thick slices. Tear the bread into rough 1/2-inch pieces (about 3 cups) and place on a rimmed baking sheet. Finely grate 2 garlic cloves into a small bowl. Add 3 tablespoons extra-virgin olive oil and 2 tablespoons grated Parmesan, and stir to combine. Drizzle over the bread, toss to combine, and spread into a single layer. Season lightly with kosher salt and black pepper.
3. Bake until lightly golden-brown and crisp, 10 to 15 minutes. Meanwhile, make the dressing.

Make the dressing:

1. Juice 1 medium lemon until you have 2 tablespoons. Place the lemon juice, 4 anchovy fillets, 2 large egg yolks, 1 garlic clove, 1 teaspoon Worcestershire sauce, 3/4 teaspoon Dijon mustard, and 1/2 teaspoon black pepper in a blender. Blend on high speed until smooth, about 15 seconds.
2. With the blender on high speed, very slowly stream in 1/2 cup extra-virgin olive oil and blend until creamy and completely emulsified, about 90 seconds total. (To avoid splatter, you can partially cover the opening with a kitchen towel.) Pour the dressing into a small bowl. Taste and season with kosher salt and more black pepper as needed.
3. Finely grate 1 ounce Parmesan cheese on a Microplane (about 2/3 cup), or measure out 1/2 cup store-bought grated. Add 2 tablespoons of the grated cheese to the dressing and stir to combine.
4. Halve 2 medium romaine lettuce heart lengthwise, then cut crosswise into 1-inch-thick strips (about 8 cups). Alternatively, cut the leaves from the core and separate, leaving them whole. Place in a large bowl.
5. Add about 2/3 of the dressing (1/2 cup) and toss to coat. Add half of the remaining Parmesan and half of the croutons. Toss to evenly distribute. Taste and toss with more dressing as needed. Transfer to a serving plate. Garnish with remaining croutons and Parmesan. Finish with a few cracks of black pepper.