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1
Blanch beef and marrow bones in boiling water for 3 minutes; drain, rinse under cold water to remove scum, pat dry.
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2
Bring 2.5 litres cold water to boil; submerge blanched beef, marrow bones, bouquet garni, juniper berries and peppercorns. Return to boil, immediately reduce to gentle simmer and skim foam for 5 minutes.
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3
Simmer undisturbed for 90 minutes; broth should be clear and fragrant.
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4
Add halved onions, carrot batons, celery and leeks; simmer 60 minutes more until beef is tender and vegetables are barely cooked through.
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5
Increase heat to rolling boil; add potatoes and turnips, cook for 20 minutes until just tender but not falling apart.
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6
Season broth carefully with Guérande salt tasting throughout; correct with additional salt or juniper if needed.
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7
Serve beef, marrow bones and vegetables in warmed bowls with generous ladle of hot broth; accompany with cornichons, sea salt and crusty bread.