Spiced beetroot relish recipe

Ingredients

• 300ml red wine vinegar
• 300g caster sugar
• ½ tsp nigella seeds
• ½ tsp cumin seeds
• Seeds from 2 cardamom pods
• 2 long red chillies, deseeded and finely chopped
• 2 bunches beetroot, peeled and grated on a box grater
• 30g finely chopped fresh ginger
• 2 large banana shallots, sliced
• 3 garlic cloves, finely chopped
• Pared zest ½ orange
• 1 tsp sea salt