Prepare the beef stock: In a large pot, add beef bones and cover with 4 liters of cold water. Bring to a gentle boil, skim the foam, and simmer for 2–3 hours to extract all the flavor and collagen.
Add the tripe: Once the stock is ready, remove the bones and add the pre-cooked tripe. Simmer for another 30–40 minutes until tender.
Add color and flavor: In a small pan, sauté the grated carrot in oil until golden. Add it to the soup for that perfect yellow hue and richness.
Finish with cream mixture: In a bowl, mix sour cream, egg yolks, and crushed garlic. Slowly temper the mixture with a few ladles of hot soup, then pour it back into the pot, stirring constantly. Do not boil after this step.
Adjust seasoning: Add vinegar and salt to taste. Serve hot, with extra sour cream and fresh bread on the side.