Watermelon skin and pork ribs soup

Ingredients (serves 4):
1/4 watermelon, remove the flesh
400g pork ribs
2 litres water
Salt, for taste

Method:
1. Cut the watermelon rind into large pieces.
2. Scald the pork ribs and the watermelon rind separately with boiling water.
3. Pour 2 litres of water into a pot and bring it to a boil, then add the scalded pork ribs and watermelon skin.
4. Bring the pot of ingredients to a boil again at high heat, then lower the heat and let it simmer for 2 hours. Season with salt before serving.

Recipe source: Simply Her magazine (Dec 2007)