You will need
3 large very ripe tomatoes, sliced into small wedges
1 bunch small radishes, washed and sliced
½ English cucumber unpeeled, halved lengthways and then finely sliced
3 spring onions with green tops, sliced on the diagonal
a handful of fresh mint leaves, roughly chopped
a handful of fresh basil or parsley leaves, roughly chopped
Make the dressing in advance and keep it in the fridge.
Toss the vegetables, mint and basil together. Pour Dressing over just before serving.