Double cheese and beef burger

Ingredients

• 600 gram beef mince
• 1 white onion, coarsely grated
• 1 tablespoon worcestershire sauce
• 8 slices cheddar cheese
• 1/2 cup tomato chutney
• 1 tablespoon smoky barbecue sauce
• 4 crusty bread rolls, split
• 8 butter lettuce leaves, torn
• 2 tomatoes, sliced
• 1/3 cup drained sliced bread and butter pickles
• potato wedges, to serve