Ingredients
- 1½ tbsp olive oil
- 1 onion, very finely chopped
- 70g smoked pancetta, finely chopped
- 1 garlic clove, crushed
- 4 thyme sprigs, leaves picked
- 500g lean beef mince (no more than 10% fat)
- 50g fresh breadcrumbs
- 1 egg yolk
- 60g mature cheddar, grated
- 60g grated mozzarella
- 120g mayonnaise
- 2½ tsp English mustard
- ½ small bunch of parsley, finely chopped
- ½ small bunch of basil
- 50g baby gherkins, finely chopped
- 4 seeded burger buns, split
- 2-3 Little Gem lettuces, leaves separated
- 2 ripe tomatoes, sliced
- crispy fried onions
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