Salmon en croûte | Fish People

Ingredients

• Small knob of butter
• 1 fat garlic clove, crushed
• 100g baby leaf spinach
• 100g watercress
• 2 tbsp chopped fresh dill
• Finely grated zest ½ lemon
• skinless salmon fillets (1 per person)
• 2 tsp grated hot horseradish from a jar or tube
• 3 tbsp crème fraîche
• 450g all-butter puff pastry (see tips)
• Plain flour for dusting
• 2 tbsp Dijon mustard