Slow-Roasted Filet of Beef with Basil Parmesan Mayonnaise

Barefoot Contessa
16Ingredients
Calories
50Minutes

Ingredients

  • 1 whole filet (beef tenderloin, trimmed and tied, 4½ pounds)
  • 3 tablespoons olive oil (good)
  • 4 teaspoons kosher salt
  • 2 teaspoons coarsely ground black pepper
  • 15 fresh tarragon (branches)
  • mayonnaise (Basil Parmesan, for serving, see recipe)
  • 2 large egg yolks (extra-, at room temperature)
  • 3 tablespoons lemon juice (freshly squeezed)
  • 1/2 cup grated parmesan cheese (freshly)
  • 1 tablespoon dijon mustard
  • 1/2 cup fresh basil leaves (chopped, lightly packed)
  • 1/2 teaspoon minced garlic
  • kosher salt
  • freshly ground black pepper
  • 1 cup vegetable oil (at room temperature)
  • 1/2 cup olive oil (good, at room temperature)
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