Pickled onion pork pies - Good Food Middle East

Ingredients

• 1 tbsp butter
• 1 onion, very finely chopped
• 100g smoked bacon, finely chopped
• 250g pork mince (shoulder is good)
• 1 garlic clove, grated
• ¼ tsp ground mace
• ¼ tsp cracked black pepper
• ½ tsp thyme leaves
• 1 egg
• 30g fresh breadcrumbs
• 6 small pickled onions
• 250g strong flour
• 50g polenta
• ½ tsp bicarbonate of soda
• 75g cold lard, diced, plus extra for the tin
• 2 egg yolks, beaten, for glazing