Healthy Beef Burger Patties (with hidden vegetables)

• 1 large brown onion
• 3 cloves of garlic
• 1 wholemeal bread roll (or 2 slices of bread)
• 1 red chilli (optional)
• 1 tsp salt
• 1 cup fresh herbs (e.g. parsley, mint, coriander/cilantro)
• 250 g mushrooms
• 500 g beef mince
• 1 tbsp Worcestershire sauce
• 2 eggs, free range