Thai Mussels

Another very simple dish:

Juice of 3 lemons
Fish Sauce or light soy sauce
3 Tbsp sugar
1 Onion peeled and sliced vertically
6 Red chillies, chopped
Handfull of basil, shredded
One stalk lemongrass, finely sliced
2Kg mussels

Mix together the lemon juice, an equal quantity of fish sauce and the sugar. Bring to boil in a small saucepan and remove from the heat. Put the mussels in casserole dish or large saucepan. Sprinkle the rest of the ingredients on top. Pour the lemon juice mixture over the mussels, then cover and boil until the mussels open.