- Prep the lamb: Season with salt and pepper, dredge in flour, shaking off excess.
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Brown meat: Heat oil in a Dutch oven over medium-high heat. Brown lamb in batches for 3–4 minutes per batch. Remove and set aside.
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Sauté aromatics: Add onion to the same pot and cook ~3–5 minutes until translucent. Add garlic and cook 1 minute.
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Deglaze: Pour in wine/vermouth and stir to loosen browned bits. Stir in tomato paste.
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Simmer base: Return lamb and any juices to the pot. Add broth and rosemary. Bring to a simmer, cover, and simmer gently for 1 hour.
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Add root veggies: Add carrots and potatoes. Simmer, covered, for 25–30 minutes, until vegetables are tender.
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Finish with greens: Stir in blanched green beans and peas for 5 minutes to warm through. Remove rosemary sprigs before serving.