Mushroom rarebit with mash & thyme gravy recipe | Good Food

Ingredients

• 1kg floury potatoes chopped into chunks
• 25g butter
• 100ml milk
• 4 large flat mushrooms stems removed
• olive oil for brushing
• 1 medium onion chopped
• 1 tbsp plain flour
• 75ml Guinness or other stout
• 140g vegetarian mature cheddar grated
• 1 tsp English mustard
• 2 eggs beaten
• 2 tbsp extra-virgin rapeseed oil or olive oil
• 2 tsp thyme leaves plus extra to serve
• 2 tbsp plain flour
• 125ml white wine
• 300ml vegetable stock
• ½ tsp Marmite