For the rollini salad with tomatoes and smoked trout, cook the pasta in enough salted water, strain and set aside.
Braise 12 cherry tomatoes with a little olive oil and salt for about 10 minutes in a 160 degree oven.
In the meantime, wash parsley leaves well and shake dry, cut remaining tomatoes in half, slice spring onions into thin rings, remove skin from trout and pluck into coarse pieces.
Mix yogurt with vinegar and sunflower oil, add to the remaining ingredients and pasta and season well with salt and pepper.
Decorate the rollini salad with tomatoes and smoked trout with fresh parsley and serve immediately.