Im cooking beef wellington 900g, how long do I cook it for and at what temperature?

Millysgirl: Im cooking beef wellington 900g, how long do I cook it for and at what temperature?
Im cooking beef wellington tonight, the cut is fillet and it weighs 900g. How long do I cook it for and at what temperature?
Thanks for all your answers!

Answers and Views:

Answer by depps_lover
ELEGANT BEEF WELLINGTON

1 (6 lb.) whole beef tenderloin roast
Butter
1 (17 1/4 oz.) pkg. frozen puff pastry
1 med. sized onion, minced
1 (8 oz.) pkg. mushrooms, finely chopped
1/2 tsp. dried thyme leaves
1/2 tsp. salt
1/4 tsp. pepper
2 tbsp. red wine
1/2 lb. goose or duck liver pate OR 17 oz. can liver pate
1 egg, separated
2 tsp. milk
Bordelaise sauce
Parsley for garnish

(Ask your butcher to trim tenderloin of fat).
(Available at specialty stores).

About 2 hours before serving:

1. Preheat oven to 425 degrees F. In large oven roasting pan on rack, form tenderloin into ring so that thick end rests on thin end to hold securely. Brush beef with 1 tablespoon melted butter.

Insert meat thermometer into center of tenderloin. Roast tenderloin 40 minutes or until thermometer reaches 120 degrees F (very rare). Remove tenderloin from oven and let stand 30 minutes. Do not turn oven off.

2. Thaw pastry as label directs.

3. Meanwhile, in 10 inch skillet over medium-high heat, in 3 tablespoons hot butter, cook onion until tender. Add mushrooms, thyme, salt, and pepper, and cook, stirring occasionally, until all liquid evaporates. Stir in red wine and cook over medium heat until mixture is dry. Remove skillet from heat; cool slightly.

4. On lightly floured surface, with floured rolling pin, roll 1 sheet puff pastry into 14 x 12 inch rectangle. Place puff pastry sheet on ungreased large cookie sheet. Center partially roasted tenderloin ring on dough. With knife, cut pastry with 1 inch border all around tenderloin.

5. Spread pate evenly over tenderloin; top with mushroom mixture. With pastry brush, brush some egg white on pastry around tenderloin. On lightly floured surface, roll second sheet puff pastry as above; place loosely over tenderloin ring, pressing pastry around base of tenderloin to seal; crimp pastry border to make a pretty edge.

6. In cup, with fork, beat egg yolk with milk; brush top and sides of pastry with egg mixture. Bake Beef Wellington 10 minutes; reduce heat to 375 degrees F; bake 20 minutes longer or until crust is golden. With 2 pancake turners, transfer roast to warm platter. Let stand 15 minutes for easier slicing.

7. Prepare Bordelaise Sauce.

8. To serve, garnish with parsley, cut Beef Wellington into wedges. Serve with Bordelaise Sauce.

Makes 10 servings.

BORDELAISE SAUCE:

In heavy 1 quart saucepan over low heat, in 3 tablespoons hot butter, cook 1 tablespoon minced onion until tender. Stir in 3 tablespoons all-purpose flour; cook until lightly browned; add 1 tablespoon chopped parsley, 1/4 teaspoon dried thyme leaves, and 1/8 teaspoon ground black pepper.
Slowly stir in one 10 1/2 ounce can condensed beef broth (bouillon), 1/2 cup red wine, and 1/4 cup water. Increase heat to medium-high; cook mixture, stirring constantly, until sauce boils and thickens.