Mushroom pâté with onion and chilli chutney

INGREDIENTS

• 100ml/3½fl oz vegetable oil
• 400g/14oz mixed mushrooms
• 1 onion
• 200g/7oz unsalted butter
• pinch cayenne pepper
• 1 tsp freshly grated nutmeg
• 1 garlic
• 1 lemon
• 1 tbsp vegetable oil
• 3 red onions
• 1 red chilli
• 75g/2¾oz caster sugar
• 75ml/2¾fl oz red wine vinegar
• salt and freshly ground black pepper
• 3 gherkins
• 1 tbsp chopped fresh thyme
• 8 slices brioche