Steak, Truffle Béarnaise Sauce, Truffle Potato Terrine

Béarnaise Sauce is considered by many to be one of the finest sauces to serve with steaks. We agree, when it is made with our white truffle butter. Why? The best way to make Béarnaise Sauce is to use clarified butter and our truffle butter is just that!

Servings

Serves 2   

Timing (for the Bearnaise Sauce only) 

Prep time: 5mins, cooking time: 20 minutes, total time: 25mins 

Tips

• Be careful not to overheat when whisking as this will cause the sauce to split. You should be able to touch the bowl with your hand without getting burned, otherwise the eggs will scramble.
• If the sauce appears to be on the verge of splitting, as indicated by a slight greasy appearance, take it off the heat and whisk in a dash of cold water.
• This link to Jamie Oliver's Hollandaise technique is very helpful.

Ingredients

For the Base:

• 30ml white wine vinegar
• 2 chopped banana shallots
• 10 tarragon stalks
• 5g black peppercorn

For the Truffle Béarnaise:

• 2 eggs yolk
• Reduced vinegar base
• 20g chopped shallot
• 5g finely chopped tarragon leaves
• 140g White Truffle Butter
• Black pepper and fine salt for seasoning 

For the Truffle Potato Terrine:

Recipe here

For the Steak:

Recipe here

Method:

1. Make a reduction by boiling the white wine vinegar, tarragon stalks, peppercorns and the 2 chopped shallots until reduced to syrup texture, around 30ml. Will take between 25-35mins depending on the shallowness of your saucepan and heat. 
2. Strain and press until you're left with juice only. Add the 20g chopped shallots, cover and allow to cool. 
3. Get a saucepan and a heatproof mixing bowl that will sit stably over the saucepan. Half-fill the pan with water and bring to a simmer. Turn down the heat as low as it can go while maintaining the simmering.
4. Take the lid off the white truffle clarified butter and microwave for 10-15 seconds, until it melts. 
5. Place the egg yolks in your heatproof mixing bowl, which you should then place over the pan of simmering water. (NOTE: the saucepan HAS to be  on a low heat, or the eggs will scramble.)
6. Start whisking your eggs in an 8 shape, then whisk in your vinegar reduction.
7. Keep whisking, and then start adding the melted truffle clarified butter by very slowly drizzling it in, whisking all the time, till all the butter has been incorporated. The result should be a smooth, thick sauce.
8. Add the chopped tarragon and mix.
9. Season carefully with sea salt and black pepper, and loosen if necessary with a dash of cold water. 

It’s so fast, you could even make the Béarnaise with white truffle butter while your cooked steak is resting!