Mussels in Cider

Ingredients

• 1 kg mussels, beards removed
• 1 tbsp olive oil
• 50 g unsalted butter
• 1 onion, finely chopped
• 2 cloves garlic, minced
• 2 Granny Smith apples, peeled and diced
• 400 mL apple cider
• 200 mL cream
• 1 tbsp Dijon mustard
• ¼ cup flat leaf parsley, chopped, plus extra for garnish
• Sea salt and freshly ground black pepper