Tomato Olive And Feta Salad

Name: Tomato, Olive And Feta Salad
Ingredients: 250 g cherry tomatoes, halved; 2 Lebanese cucumber, sliced; 1 red onion, thinly sliced; 1 cup (175g) black olives; 300 g firm feta, sliced; ¼ cup (60ml) red wine vinegar; 2 tablespoons olive oil; 2 tablespoons Dijon mustard; 2 teaspoons caster (superfine) sugar; sea salt and cracked black pepper