Paprika lamb burgers with aioli

Good old Tesco delivered a shop 5 minutes after we got back from our holiday yesterday. I did a quick order the night before and ordered some lamb mince, red onions and bread rolls with the idea of making some lamb burgers. I knew I would have some other ingredients at home to add to them. I found this recipe on the BBC Good Food site. 

Ingredients
Serves 4

450g minced lamb
1 red onion, ½ grated, ½ sliced
½ small bunch parsley, chopped (I didn't have this)
1 tsp smoked paprika
½ tsp ground cumin
pinch dried chilli flakes (optional)
4 tbsp mayonnaise
½ garlic clove, crushed
4 crusty rolls
1 beef tomato , sliced
Little Gem lettuce leaves, to serve

Method
Put the first six ingredients, except the onion slices, in a bowl with lots of seasoning. Mix together with your hands, then form into four burgers. Mix the mayo with the garlic to make aïoli. Fry the burgers for 4-5 minutes on each side until cooked through but juicy.
Layer the rolls with lettuce, burgers, onion slices and tomato and a big dollop of aïoli.