2 red chillies, seeds removed, if preferred, and thinly sliced
3 tbsp roughly chopped fresh coriander, plus more to garnish (optional)
2 large garlic cloves, crushed or grated
1 tbsp finely grated fresh root ginger
1 lime, juice only
2 onions (approximately 300g/10陆oz), thinly sliced
陆 red onion, thinly sliced
125g/4陆oz young spinach
2 tbsp English mustard
red wine vinegar or lime juice, to cover
2 tsp sea salt flakes (or 1 tsp fine sea salt)
3 tbsp cold-pressed rapeseed or vegetable oil
12 fish fingers