Chicken burger with avocado and bacon

Ingredients

• Chicken patties
• 3/4 cup (50g) fresh breadcrumbs (see notes)
• 1 tablespoon milk
• 500 grams chicken mince
• 4 green onions, sliced thinly
• 2 tablespoons chopped flat-leaf parsley
• 2 drained anchovy fillets, chopped finely
• 1/4 cup (75g) whole egg mayonnaise
• 1 garlic clove, crushed
• 1 teaspoon dijon mustard
• 1 1/2 teaspoon lemon juice
• 4 rashers bacon, end and excess fat removed, each cut into thirds
• 2 teaspoons olive oil
• 4 wholegrain rolls, split
• 4 baby cos lettuce leaves
• 1 medium (250g) avocado, sliced thickly
• freshly ground black pepper