Grilled beef with jaew

Name: Grilled beef with jaew
Ingredients: 2 large red chillies; 3 g large garlic cloves; 1 stalk lemon grass; 2 1/2 cm (1in) piece galangal or fresh root ginger; 8 shallots; 30 mL (2 level tbsp) palm sugar or dark soft brown (muscovado) sugar, plus extra to taste; 15 mL (1 level tbsp) tamarind paste; 15 mL (1tbsp) Thai fish sauce; Juice of 1 lime; 450 g (1lb) beef fillet; A little oil for frying; 1 small head Chinese leaves; 3 ripe tomatoes; 1 cucumber; Handful fresh mint sprigs; Handful fresh coriander sprigs