Croatian Lamb “brodet”

Name: Croatian Lamb “brodet”
Ingredients: 600 g boneless lamb; 80 g bacon (pancetta); 2 medium onions; 1 carrot; 10 g celery root; 1⁄4 liter white wine; 2 teaspoons lemon juice; ground nutmeg; 1 egg yolk; 40 g goat cheese or 40 g sheep's milk cheese, grated; 1⁄4 teaspoon butter; 2 teaspoons olive oil; pepper; salt