Homemade beef burgers

Ingredients

• 500g lean beef mince
• 1 egg
• 1 tbs of olive oil
• ½ cup spring onion (green part) – finely chopped
• ¼ cup of fresh continental (flat) parsley – finely chopped
• ¼ cup of fresh coriander – finely chopped
• Handful of chives
• 2 medium sized button mushrooms** – finely chopped
• Cracked pepper