Grilled Steak With Bearnaise
["1 (2 lb.) flank steak", "2 cloves garlic, minced", "2 Tbsp. vegetable oil", "1 Tbsp. white wine vinegar", "1 tsp. salt, divided", "1/2 tsp. white pepper", "1/2 c. white wine or broth", "2 Tbsp. each chopped shallot and fresh tarragon, divided", "2 Tbsp. chopped fresh chervil, divided", "1 bay leaf", "4 egg yolks", "1 1/2 tsp. water", "8 Tbsp. (1 stick) butter"]
["Score both sides of steak in a diamond pattern. Rub with garlic.", "Place in a shallow bowl. Coat lightly with the vegetable oil, vinegar, 3/4 teaspoon salt and 1/4 teaspoon white pepper. Let steak stand for 30 minutes."]
["flank steak", "garlic", "vegetable oil", "white wine vinegar", "salt", "white pepper", "white wine", "shallot", "fresh chervil", "bay leaf", "egg yolks", "water", "butter"]