Pommes Boulangères - Edible Portland

Ingredients

• 1.25 kg white onions
• 80 g butter, plus extra for greasing
• 2 star anise
• 800 ml chicken stock
• 200 ml pouring cream
• 100 ml dry white wine
• 100 g butter, chopped
• 5 sprigs lemon thyme
• 5 sprigs rosemary
• 1.25 kg waxy potatoes
• freshly ground black pepper
• 100 g parmesan, finely grated
• 1/2 teaspoon lemon thyme leaves for garnish