Cold Cucumber and Avocado Soup

A quick, refreshing summer soup, for the hot summer that has been forecast! Serves 2 or 4 as a starter:

• 1 cucumber
• 1 tbsp sugar
• 2 ripe avocados
• 1 clove garlic (optional)
• 2 tbsp plain yoghurt
• 5 mint leaves
• 2 tbsp white wine vinegar
• ¼ pint chicken or vegetable stock

Put all the ingredients into a food processor. Season with plenty of freshly ground black pepper, and a little salt. Whizz everything together, pour into bowls, and garnish with a sprig of mint. Serve with warm rolls.