1 tsp ground coriander
15cm/6in piece cucumber, sliced
2 garlic cloves, peeled and crushed
1 romaine lettuce or 3 baby gem lettuces, leaves thickly shredded
½ lime, juice only
1 small onion, finely chopped
4 spring onions, trimmed and sliced
3 ripe vine tomatoes, sliced
4 tbsp fresh tomato salsa sauce
300ml/½ pint beef stock, made with 1 beef stock cube
freshly ground black pepper
½ tsp caster sugar
1 tsp hot chilli powder
1 tsp ground cumin
flaked sea salt
1 tsp sunflower oil
2 tbsp tomato purée
40g/1½oz mature cheddar
4 tbsp half-fat crème fraîche
300g/10½oz lean beef mince (less than 10% fat)
4 large flour tortillas