Cheeseburger with mushrooms, onions and a home-made ranch dressing – Mediterranean Delicacies

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