Bangers and mash with leek and mushrooms

Ingredients

• 1.5 kilogram potatoes
• 500 gram pork sausages
• 90 gram butter, chopped
• 200 gram Portobello mushrooms, sliced
• 1 leek, trimmed, sliced
• 2 teaspoon lemon thyme leaves
• 1 garlic clove, crushed
• 2 teaspoon Dijon mustard
• 1/2 cup dry white wine
• 1/2 cup milk
• 1/2 cup cream
• parsley, green vegetables to serve