Sausages with Grain Mustard Mash & Onion Gravy

Ingredients

• 4 medium potatoes (approx. 600g), peeled & quartered
• 3 litres water
• 60g salt (18g for water, remainder for mash)
• 100g butter, diced
• 100g warmed milk
• 30g wholegrain mustard
• 8 turns black pepper
• 1 large onion, thinly sliced
• 3 garlic cloves, finely chopped
• Few sprigs fresh thyme (or pinch dried)
• 2 bay leaves
• 8g salt
• 30g demerara sugar
• ¼ tsp crushed black pepper
• 200ml stout or dark beer
• 150ml balsamic vinegar
• 200ml chicken stock
• 1 tsp English mustard
• 1 tsp flour
• 50ml vegetable oil
• 20g butter
• 8 quality pork sausages
• Small knob of butter (for frying)