Pickled beetroot - Good Food Middle East

Ingredients

• 1kg beetroot
• vegetable oil
• 4-5 tsp coarse crystal sea salt
• 1 tbsp black peppercorns
• 1 tbsp coriander seeds
• 1 tbsp yellow mustard seeds
• 10 cloves
• few pieces of mace blades
• pinch of dried chilli flakes (optional)
• 2 bay leaves
• 700ml white wine vinegar, plus 3½ tbsp
• 100g light brown soft sugar