Pork and apple Burgers

Ingredients

• 750g pork mince
• 75g fresh breadcrumbs
• 2 tsp finely chopped fresh sage
• 1 dessert apple, coarsely grated
• 2 spring onions, finely chopped
• 1 free-range egg, lightly beaten
• sea salt and freshly ground black pepper
• 1 tsp olive oil
• 4 burger buns
• 1 head Little Gem lettuce, leaves separated
• 2 tomatoes, thickly sliced
• ½ small red onion, cut into rings
• English mustard, to taste
• cheese