Scarily Boo-tiful Beef Stew with Ghostly Potato Pals

WHAT YOU'LL NEED

• 2 tablespoon olive oil
• 500 grams diced casserole beef steak cut into 2.5 cm pieces
• 10 g flour
• 1/2 teaspoon English mustard
• 1 large onion
• 1 large celery stick
• 75 g carrots
• 2 cloves garlic
• 300 g mushrooms sliced
• 500 g pumpkin
• 400 g tinned white beans drained
• 400 g canned chopped tomatoes
• 1 bay leaf
• 3 thyme stems trimmed
• 3 rosemary stems trimmed
• 1/2 tablespoon Worcestershire sauce
• Pepper
• 300 ml Knorr organic beef stock
• 1.5 kg flour potato
• 125 ml semi skimmed milk
• 1 tablespoon Flora butter
• Peppercorns to create ghostly potato pals eyes
• 1 piping bag