Tomato, Cucumber and Tamarind Salad

1 cup sliced cucumber
1 red onion, finely sliced
3 medium tomatoes, sliced
2 tablespoons tamarind pulp
200ml boiling water

Place the tamarind pulp (available in blocks from Asian speciality stores) in a jug and pour over the boiling water. Allow to stand for 10 minutes, stirring once or twice. Strain through a sieve to remove the hard pieces. Put the sliced cucumber, tomato and onion in a shallow dish and pour over the tamarind liquid.