Cook the pasta in boiling salted water for 8-10 minutes until al dente. Meanwhile peel and chop garlic and onion and fry them in hot oil. Add tomatoes with juice, puree in the pot with a snow stick and bring to the boil briefly.
Chop 1 anchovy fillet finely and add to the sauce with capers and olives. Season with salt, pepper and lemon juice. Fold in the noodles and arrange everything on plates. Wash the basil, remove the leaves and sprinkle over the pasta.
Garnish with a slice of lemon and the remaining rolled up anchovy fillets.