Cook the spaghetti in plenty of boiling salted water until al dente. Rinse with cold water on a sieve and allow to cool.
Dice the tomatoes and cut the spring onions into rings. Sort and wash the rocket.
Mix the balsamic vinegar with salt and pepper and gradually stir in the olive oil.
Spread the rocket evenly on a large platter (or 4 plates). Spread the spaghetti, tomatoes and spring onions on top and spread the dressing evenly over the top.
If you like, you can also mix in the capers and garnish with Parma ham florets. For us the capers are a must, but if you are a caper hater you can leave them out.
Another variant: use spicy spaghetti (with pepperoni), also very tasty.