1. Heat the oil in a medium pan; cook onion, ginger and garlic, stirring until soft.
2. Add juice, sugar and tamarind and the water and bring it all to the boil then simmer it for about 3 minutes.
3. Stir in the tomato and simmer for another 20 minutes until the mixture thickens.
4. Add the yabbies, cook stirring for about 5 minutes until the yabbies are just changed in colour.
5. Serve with spinach.