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1
Season the lamb pieces assertively with salt and pepper. Heat the oil in a wide, heavy braising vessel over high heat. Brown the lamb in batches — do not crowd the pan. Each piece must develop a dark, caramelised crust on all surfaces. Pale meat at this stage means a pale, flavourless sauce throughout. Remove the meat and set aside. The cue: the fond on the base of the pan is deep mahogany and fragrant.
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2
Pour off excess fat from the pan, leaving only the residue. Add the 2 tablespoons of sugar directly to the hot pan and allow it to caramelise lightly in the fat residue — this is the pincer technique. Return the browned lamb, toss to coat in the caramel, then sprinkle over the flour. Cook for 2 to 3 minutes, stirring, until the flour has absorbed the fat and lost its raw smell. The cue: the flour smells toasted and the mass is dry and cohesive.
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3
Add the brown stock, white wine, tomato concassée, bouquet garni, and garlic cloves. Stir to lift the fond from the base. Bring to a simmer, cover, and transfer to an oven preheated to 160 °C. Braise for 1 hour undisturbed. The cue: a slow, steady bubble is audible at the lid when the vessel is placed in the oven.
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4
After 1 hour, remove the vessel and skim the surface thoroughly, removing all risen fat and impurities. Add the tournéd carrots, turnips, pearl onions, and potatoes. Return to the oven, covered, for a further 30 to 40 minutes. The cue: a skewer meets no resistance in the thickest piece of lamb, and the root vegetables are tender yet retain their individual shape and identity.
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5
Remove the bouquet garni. Skim any remaining fat from the surface. The sauce should have reduced naturally to a nappant consistency — coating the back of a spoon and clinging to the meat without being thick or gluey. If too loose, remove the meat and vegetables and reduce the sauce briefly on the stove before recombining. The cue: a line drawn through the sauce on a spoon holds its edges cleanly.
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6
Adjust seasoning with salt, pepper, and a squeeze of lemon juice to cut the richness of the lamb. Scatter chopped flat-leaf parsley or fresh mint over the surface before serving. The cue: the finished navarin is balanced — savoury, bright, and rounded, with no single element dominating.