Lamb Burgers With Spicy Mango Tomato Sauce - cooking recipe

Ingredients

2 tbsp + 2 tsp olive oil, plus extra or brushing
2 None brown onions, peeled and chopped
4 None garlic cloves, peeled and finely chopped
1 None ripe mango, peeled, stoned and flesh chopped
2 x 400 9 cans chopped tomatoes
100 ml white balsamic vinegar
1 None red chilli, chopped
60 g brown sugar
1 tsp allspice
1/2 tsp salt
1 None aubergine, trimmed and sliced into 1cm thick disks
2 None red onions, peeled and cut into thin wedges
1 None shallot, peeled and chopped
200 g minced lamb
200 g minced beef
1 tbsp wholegrain mustard
1 medium egg yolk
3 sprigs coriander, chopped
3 sprigs oregano, leaves picked and chopped, plus extra leaves for sprinkling
3 sprigs parsley, chopped
4 None wholemeal, seeded buns
4 None round lettuce leaves

Preparation

Heat 1 tbsp of the oil in a large frying pan, add the onions and half the garlic and cook until the onions are translucent. Add the mango, tomatoes, vinegar, chili, sugar, allspice and 1/2 tsp salt. Simmer gently, covered, for 50 mins, stirring occasionally.
Remove the sauce from the heat and allow to cool slightly. Using a stick blender, roughly puree. Season to taste with salt and freshly ground black pepper. Set aside to cool.
Meanwhile, brush the eggplant slices with oil. Heat a grill pan and cook the eggplant for 1-2 mins each side (you may need to this in batches). Remove and keep warm.
Heat 1 tbsp of the oil in a frying pan, add the red onions and saute for 2 mins. Remove and keep warm.
Heat 1 tsp of the oil in the frying pan, add the chopped shallot, remaining garlic and cook until the shallot is translucent. Place in a large bowl and add the ground meat, mustard, egg yolk and chopped herbs. Season to taste with salt and freshly ground black pepper and mix well. Shape into 4 burgers.
Heat the grill pan. Brush the burgers with oil and cook for 2-3 mins on each side until cooked to your liking.
Grill the cut side of the buns to lightly toast. Fill buns with the eggplant slices, burger patties, mango tomato sauce, lettuce, and a sprinkling of oregano leaves.