Slow-Roasted Filet of Beef with Basil Parmesan Mayonnaise | Barefoot Contessa

"1 whole filet of beef tenderloin, trimmed and tied (4½ pounds) 3 tablespoons good olive oil 4 teaspoons kosher salt 2 teaspoons coarsely ground black pepper…..."

INGREDIENTS
2 extra-large egg yolks, at room temperature
3 tablespoons freshly squeezed lemon juice
1/2 cup freshly grated Parmesan cheese
1 tablespoon Dijon mustard
1/2 cup chopped fresh basil leaves, lightly packed
1/2 teaspoon minced garlic
Kosher salt and freshly ground black pepper
1 cup vegetable oil, at room temperature
1/2 cup good olive oil, at room temperature
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