Vadouvan spiced mini rolls

Name: Vadouvan spiced mini rolls
Prep time: 30 min
Cook time: 2 h 30 min
Total time: 2 h 30 min
Yield: 20 portions
Ingredients: 200 g red onion; 30 g olive oil; ½ tsp sea salt flakes; 30 g red wine vinegar; 30 g raw sugar; 1 tsp fenugreek seeds; 2 tsp cumin seeds; 1 tbsp coriander seeds; 1 tsp ground turmeric; 20 fresh curry leaves; 1 tbsp brown mustard seeds; 2 tsp dried chilli flakes; 1 tsp sea salt flakes; ½ tsp black peppercorns; 280 g water; 1 tsp dried instant yeast; ½ tsp sea salt flakes; 500 g baker's flour; 30 g olive oil; olive oil