Peel and slice the carrot, peel and chop one onion, discard the green part of the leek and slice the white part. In a large pot, sauté these vegetables with a drizzle of olive oil. Add 1 liter of water, thyme, bay leaf, salt, and pepper. Cover and simmer for at least 30 minutes, then strain the broth.
Bring the broth to a boil and blanch the peas for 5 minutes. Remove them with a slotted spoon and set aside. Take a ladle of broth and blend it with a quarter of the peas to make a pea puree. Tear the bresaola slices into pieces and set aside.
Peel and finely chop the remaining onion. Sauté it in a pot with a drizzle of olive oil, then add the rice. Once the rice and onion are translucent, deglaze with the white wine. Once the wine is absorbed, add a ladle of broth and stir. Continue adding broth each time the liquid is absorbed, cooking for 20 minutes.
Add the peas and the pea puree and cook for another 5 minutes. Stir in the grated Pecorino cheese, mix well, and serve in deep plates. Sprinkle with bresaola pieces and serve immediately.