1 (12~16 oz) center-cut beef tenderloin salt and pepper, to taste
1 Tbs olive oil 1 cup dry red wine 1/4 cup red wine vinegar 2 Tbs minced shallot 1 stick (4 oz) chilled butter, cut into 1 inch cubes
Directions
For the steak
1) preheat the oven to 450 F. Season the steak generously on all sides with salt and pepper.
2) Heat the olive oil in an oven-safe skillet until shimmering, then sear on both sides, about 1 minute a side.
3) Transfer the pan to the oven and cook 10 -15 minutes, until the internal temperature registers 135F.( medium rare) on an instant -read thermometer. (10分でオーケー)
4)Take the pan out of the oven, cover with aluminum foil, and let rest for 10 minutes before serving.
For the beurre rouge
1) Combine the red wine, vinegar and shallots in a small sauce pan over high heat: bring to a boil and cook until reduced by about 3/4, about 15 minutes.
2) Reduce heat to low and whisk in the butter, a piece at a time, until an emulsion forms. Finish adding the butter, taste and adjust seasonings,
1) Cut the potatoes into 1- inch chunks; cover with cold salted water, bring to a boil, reduce to a simmer, and cook until smashable, approximately 10 minutes. (電子レンジで9分ほど加熱でもオーケー)
2)Drain, place in a mixing bowl, and mash with a potato masher or a fork.
3) Fold in the minced shallot, olive oil, mascarpone, butter, lemon juice and zest.