Avocado and Feta Salad

Separate the lettuce hearts into individual leaves, wash under running water and tear into smaller pieces if necessary. Wash the tomatoes, cut out the hard cores at the top where the stems were attached and slice the tomatoes. Halve the avocados, remove the stones and cut the fruit into thin wedges. Remove the peel. Mix the avocado with 2 tbsp lime juice. Dice the feta. Carefully mix all the salad ingredients and arrange attractively in 4 bowls. Mix the rest of the lime juice with the oil, sour cream, salt and pepper and sprinkle over the salad. Trim and deseed the chilli and shred very finely. Scatter over the salad and serve.