The chicken is poached in a butter-covered muslin and slowly cooked in stock and wine.
The Ritz, London recipe using nurtured in norfolk’s micro cress, edible flowers, edible leaves, herbs, sea veg, pea shoots and micro/baby veg.
Place the chicken on a board and, starting from just above the wishbone, lift the skin that runs along the breast of the bird. Stuff the tarragon and fennel fronds between the skin and breast, taking care not to split the skin.
Take a clean muslin cloth and cover it with a layer of softened butter. Dust the butter with some flour. Spread another layer of butter on top and dust again with the flour.
Place the chicken in the muslin and roll the cloth around the chicken to wrap it tightly. Tie the ends of the muslin with kitchen string.
Pour the stock and wine into a saucepan or flameproof casserole dish. Add the chicken, breast-side up, to the pan. It should be mostly submerged, so top up with stock or wine if necessary. Add the mushrooms, shallots, garlic, carrots, celery sticks, fennel pieces and star anise.
Bring to the boil and then reduce to a medium–low heat. Put a lid on the pan and simmer for 50 minutes. Turn off the heat, but leave the chicken sitting in the stock for another 20 minutes.
Drain the stock through a colander into a clean saucepan below, reserving the vegetables. Discard the garlic and star anise. Place the stock over a medium–high heat and simmer until reduced by at least two-thirds.
While the stock is reducing, untie the muslin and remove the chicken. Try to keep the flour and butter intact, which should have become pastry-like during cooking. Cover the chicken in foil to keep warm.
Scrape the flour and butter paste into a bowl and then whisk it slowly into the stock, until the sauce thickens. Season with salt and pepper and pass the sauce through a fine-mesh sieve into a saucepan. Add the cream and remaining 50g/1¾oz butter to the sauce and stir. Taste and adjust seasoning. Return the vegetables and mushrooms to the sauce and heat through.
Serve the chicken with the sauce alongside and garnish with the leaves. Serve the Romanesco in a separate bowl.