Mix the sauce ingredients and leave to season in a cool place for a while.
Cook the pasta to "al dente".
Pour the oil from sun-dried tomatoes into the pasta. Stir and chill.
Dice the paprika. Cut the cucumber in half and scoop out the seeds with a spoon. Dice the cucumber. Cut the tomatoes into mouthfuls. Shred the lettuce into small parts.
Mix the pasta and sauce together.
Arrange the salads on plates in layers. Layer the green parts underneath, then the pasta, and top with the other ingredients.
Notes
Cook the pasta al dente (about 8–10 minutes) so it holds its texture in the salad.
Rinse the pasta briefly under cold water if you want to stop the cooking and keep it firm.
Let the salad rest in the fridge for at least 30 minutes before serving to allow the flavours to develop.
Add fresh basil just before serving to keep its aroma bright and fresh.
You can lighten the dressing by replacing part of the sour cream with yogurt.
Use good-quality tuna in oil for the best flavour and texture.
Adjust the acidity to taste – a little extra lemon juice can lift the whole dish.