Add the potatoes to cold, salted water. Bring to the boil and cook until completely soft, about 20 minutes, then allow to steam dry
While the potatoes steam dry, heat the butter, milk and cheddar in a separate pan, stirring until melted
Pass the potatoes through a ricer and then beat in the cheese and milk mix, stirring vigorously, to produce a silky smooth aligot
Return to a low heat and stir occasionally for about 20-25 minutes
To cook the chicken hearts, place a frying pan on a high heat. Add rapeseed oil and sear the chicken hearts until golden and cooked through, about 3–5 minutes. Be sure that the chicken hearts are cooked throughout, but don’t overcook them, as they will resemble rubber bullets!
Deglaze the pan with the vinegar, before adding the stock and butter
Turn up the heat and reduce the stock to form a velvety sauce. Season according to taste, and add more vinegar if needed
To plate, serve the aligot topped with the hearts and sauce, before finishing with fresh chervil sprigs
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