BBC Food - Recipes - Whisky-cured salmon with cucumber ketchup and chargrilled cucumber

Ingredients

• 25g/1oz caster sugar
• 25g/1oz fine salt
• 1 vanilla pod , seeds scraped out
• 2 tbsp whisky
• 1 x 500g/1lb 2oz side of salmon , skin on, pin bones removed
• 100g/3½oz tapioca pearls
• 200ml/7fl oz vegetable stock
• 2 tsp beetroot juice
• vegetable oil , for deep-frying
• salt
• 100ml/3½fl oz white wine vinegar
• 2 tsp caster sugar
• 2 cucumbers , roughly chopped
• 1 tsp xantham gum
• 1 cucumber , peeled, with the ends and round edges trimmed off
• rapeseed oil , for drizzling
• large handful watercress or 2 tbsp watercress sprouts