1- Make 2 preparations that will cook together
a) In a saucepan, pour your sweet potatoes cut into large chunks, cover them with water, salt then add your teaspoon of turmeric.
b) In another saucepan put your shallots to melt slowly with your mignonette, after 3 minutes pour your vinegar, white wine and tarragon leaves, let this reduce until there is only a teaspoon of liquid left add then the cream reduce by half, then pour your veal stock and let simmer gently for 5 minutes then blend your sauce* add a small knob of butter (mount) and keep it warm.
2- Test your sweet potatoes with a knife, then drain them and in a bowl crush them with a fork add the salt the nutmeg half the peanuts as well as a good knob of butter, keep warm.
3- In a pan, heat a little butter and oil when it is very hot, place your lamb noisettes which should be well seared, salt and pepper then cook them 1 minute* on each side then remove from heat and cover.
4- Here is the time to serve 10 minutes have passed after finishing this recipe
On 4 hot plates fill 4 cookie cutters a little high with your sweet potato puree then cover them with the rest of your peanuts
remove the lamb noisettes from your pan then arrange them facing your small garnish unmold them then coat with a spoon of hot tarragon sauce, and serve the rest in a sauce boat.
*You can also as for Béarnaise strain this sauce through a fine sieve but personally I prefer to find small texture elements on the palate.
* 1 minute of cooking on each side? That's very little you will say: except that when you have put your lid on your pan the meat will continue to cook a little, but especially it
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