Smoked fish kedgeree

Ingredients

• 1 onion, thinly sliced
• 1 tablespoon oil
• 1 tablespoon butter
• 2 cloves garlic, chopped
• 2 tablespoons curry powder
• 2 teaspoons mustard seeds
• 1/4 teaspoon chilli flakes (optional)
• 200 grams smoked fish, flaked into chunks
• 3 cups cooked rice (1 cup uncooked), preferably basmati
• juice from 1 lemon
• salt
• extra lemon wedges, to serve
• 2 hard-boiled eggs, quartered
• coriander, to garnish
• plain unsweetened yoghurt, to serve