Vietnamese bun cha with sticky spicy tofu

Name: Vietnamese bun cha with sticky spicy tofu
Cook time: 45 min
Total time: 45 min
Cuisine: Asian
Ingredients: sesame oil; 1 large brown onion; 350 g pack of firm tofu; 6 tbsp hoisin sauce; 2 tbsp sesame seeds; 250 g thin brown rice noodles; a small handful of peanuts; 1 long red chilli; 2 limes; chilli sauce to serve; 3 tbsp brown sugar; 1 stick of lemongrass; 3 tbsp reduced-salt soy sauce; 1 tbsp white wine vinegar; 1 tbsp toasted sesame oil plus extra to serve; 2 carrots; 1/2 cucumber; 2 baby gem lettuce; 4 spring onions; 1 small bunch of mint