Cook the spaghetti in salted water according to the instructions on the packet.
Finely chop the garlic and sauté with the sage in hot oil for about 5 minutes. Season with salt and pepper and remove.
Melt the sugar in the frying fat. Halve tomatoes, add and caramelize briefly. Roughly chop the rocket and mix with the spaghetti, tomatoes, sage, garlic and stock.