Lentil burgers with carrot pickle and peanut sauce

Name: Lentil burgers with carrot pickle and peanut sauce
Ingredients: 4 tbsp olive oil; 1 red onion, finely chopped; 1 tsp crushed garlic; 1 green chilli, chopped; 1 tsp grated fresh root ginger; 2 tbsp chopped fresh coriander stalks; 1 tbsp coriander seeds, ground; 600g/1lb 5oz cooked brown lentils, drained and rinsed; 3 tbsp gram (chickpea) flour; 3 carrots, peeled and julienned; 2 tbsp caster sugar; 2 tbsp white wine or cider vinegar; ¼ cucumber, julienned; 1 apple, peeled and julienned; salt and freshly ground black pepper; 2 tbsp smooth peanut butter; 2 tbsp plain yoghurt; 1 tbsp tahini; 2 tsp sesame seeds, toasted; 1 lemon, zest and juice; 4 brioche buns, halved; 2 Little Gem leaves, chopped; 2 beef tomatoes, sliced