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1 egg yolk*

3 tablespoons fresh lemon juice

1 tablespoon minced garlic

1/2 teaspoon Worcestershire sauce

1/4 teaspoon red pepper flakes

1 tablespoon Dijon mustard

2 anchovy fillets, mashed

Scant 1 cup vegetable oil

1/3 cup extra-virgin olive oil

Salt and freshly ground black pepper

1 large head romaine lettuce, cleaned and cut into 1 to 2-inch pieces

Freshly grated Parmesan

2 cups croutons