Bangers & Mash with Red Onion Gravy - Musk's Premium Sausages

Ingredients

• 2 packs of Musk’s Newmarket Sausages
• 1kg floury potatoes (such as King Edwards, Maris Piper or Desiree), peeled and diced
• 1 large red onion (approx 210g), finely sliced
• 200g of frozen peas
• 100ml milk
• 300ml beef stock
• 1 tbsp plain white flour
• 150ml red wine
• 50g butter
• 1 tbsp olive oil