Greek salad

Ingredients

• 50g/2oz black Kalamata olives
• 3 medium tomatoes, diced into 2cm/¾in cubes
• 1 cucumber peeled, diced into 2cm/¾in cubes
• 1 red pepper, de-seeded, diced
• ½ red onion, sliced finely
• 100ml/3fl oz extra virgin olive oil
• 150g/5oz feta, diced
• 1 small, firm cos lettuce, chopped into rough cubes lengthways
• 1 generous sprig of oregano (or 2 tsp dried oregano)
• 50ml/3 tbsp red wine vinegar