Easy Sausage, Cider & Potato Pie

Ingredients

• 500g new potatoes, cut into slices 6-8mm thick
• 25g butter
• 1 onion, sliced
• 1 dessert apple, peeled, cored and cut into chunks
• 1 tsp sugar
• 100ml good-quality cider, preferably Orchard Pig
• 1 tbsp wholegrain mustard
• 500g good-quality herby sausages
• 1 quantity of suet pastry (see ingredients below)
• A handful of grated Cheddar cheese (optional)
• 1 free-range egg, lightly beaten, to glaze
• Sea salt and black pepper
• A little chopped thyme and/or sage, to decorate
• 400g plain flour
• 1 pinch of salt
• 200g suet
• 120 150ml milk