Curried Fish Pie

1. 1 onion, diced
2. 3 cloves garlic, minced
3. 15 g ginger, minced
4. 2 tbsp curry powder
5. 25 g butter
6. 25 g plain flour
7. 400 ml milk
8. 500 g fish pie mix
9. 120 g peas
10. 10 g coriander, chopped

Mash topping

1. 1 kg potatoes
2. 25 g butter