Chicken, avocado and bacon burgers with mustard garlic mayo

Ingredients

• 3/4 cup fresh breadcrumbs
• 1 tablespoon milk
• 500 grams chicken mince
• 4 spring onions, sliced thinly
• 2 tablespoons finely chopped fresh flat-leaf parsley
• 2 anchovy fillets, finely chopped
• 1/4 cup mayonnaise
• 1 clove garlic, crushed
• 1 teaspoon wholegrain mustard
• 1 1/2 teaspoon lemon juice
• 4 rindless bacon slices (260g), each cut into thirds
• 4 wholegrain rolls, split
• 4 baby cos lettuce leaves
• 1 medium avocado, thickly sliced