Follow these simple steps to create Classic Lobster Newburg:

1. Prepare Lobster Meat: If not done already, cook the lobster tails in boiling water for about 8-10 minutes. Cool and chop the meat into bite-sized pieces.

2. Sauté Shallots: In a large skillet, melt the butter over medium heat. Add the chopped shallots and sauté for about 2-3 minutes, or until soft and translucent.

3. Add Liquids: Pour in the sherry and fish stock. Allow the mixture to simmer for 5 minutes to reduce slightly, which will enhance the flavors.

4. Mix Cream and Egg Yolks: In a separate bowl, whisk together the heavy cream, egg yolks, Dijon mustard, and Worcestershire sauce until well combined.

5. Combine Mixtures: Gradually stir the cream mixture into the skillet, and continue cooking on low heat. Stir constantly until the sauce thickens, approximately 5-7 minutes.

6. Add Lobster: Carefully fold in the chopped lobster meat and stir gently to combine. Allow it to heat through for another 2-3 minutes.

7. Season: Taste your Lobster Newburg and season with salt and pepper as needed.

8. Prepare for Serving: If desired, serve the Lobster Newburg over toasted bread or inside puff pastry shells for an elegant touch.

9. Garnish: Finish with fresh chopped parsley to add color and freshness.

These simple instructions will lead you to create an amazing Classic Lobster Newburg that is sure to impress!