Baked Potatoes with Eggplant Relish

Ingredients

• 4 large potatoes
• ½ cup vegetable oil
• 4 medium onions, sliced
• yoghurt, to serve
• coriander, to serve
• 2 tbsp cumin seeds
• 2 tsp mustard seeds
• 1 tbsp fenugreek seeds
• 2 tsp turmeric
• 1 small onion, chopped
• 60g ginger, roughly chopped
• 6 garlic cloves, roughly chopped
• 1kg eggplant, cut into 1cm cubes
• 125ml malt vinegar
• ⅔ cup sugar
• 1 tbsp salt
• 2 large red chillies, deseeded and chopped, plus extra to serve