Ingredients:
- 750g ground beef mince
- 3 tablespoons grated onion
- 1 tablespoon vegetable oil
- Mature Gouda from Mediterranean Delicacies
- 3 tablespoons butter
- 1 pound white mushrooms, sliced
- 1/4 cup chopped onion
- 1/3 cup beef broth
- 1/2 cup sour cream
- 2-3 tablespoons buttermilk
- finely chopped dill, parsley, chives and thyme
- 1/2 tablespoon fresh lemon juice
- 1/2 teaspoon hot sauce
- 1 clove garlic, grated
- 4 hamburger rolls