Watercress and tomato yogurt

Name: Watercress and tomato yogurt
Ingredients: 50 g watercress, stalks removed; 2 plum tomatoes, peeled, deseeded, chopped; 1 small red onion, finely chopped; 100 ml sour cream; 75 g sweetcorn kernels, drained; salt and freshly ground black pepper; salt and freshly ground black pepper

Preparation info