Beef Fillet With Basil Mayonnaise Recipe

Ingredients

• 1 whole fillet beef tenderloin
• 3 tablespoons good olive oil
• 4 teaspoons kosher salt
• 2 teaspoons coarsely ground black pepper
• 10-15 branches fresh tarragon
• basil parmesan mayonnaise (see below)
• 2 extra large egg yolks
• 3 tablespoons freshly squeezed lemon juice
• 1/2 cup freshly grated Parmesan cheese
• 1 tablespoon Dijon mustard
• 1/2 cup chopped fresh basil leaves
• 1/2 teaspoon minced garlic
• Kosher salt and freshly ground black pepper
• 1 cup vegetable oil
• 1/2 cup good olive oil