What temperature should sirloin steak be cooked to?
Sirloin is best served medium-rare to medium (130–135°F internal). Use a meat thermometer for accuracy, as overcooking makes it tough.
Can I make the tarragon sauce ahead of time?
The sauce is best served fresh, but you can prepare the shallot base and refrigerate it for up to 1 day. Reheat gently and finish with cream and cold butter just before serving.
What's the purpose of clarified butter for searing?
Clarified butter has a higher smoke point than whole butter, allowing you to achieve a deep sear without burning. It creates better crust and browning on the steak.
Can I substitute the tarragon?
Fresh thyme or dill work well, though tarragon's anise flavor is signature to this French sauce. Dried tarragon can replace fresh at one-third the amount.
How do I prevent the cream from breaking in the sauce?
Keep heat moderate once cream is added, and whisk in cold butter at the end off-heat. Avoid boiling vigorously, which can cause separation.