Spaghetti with Cherry Tomatoes

Cook the spaghetti in boiling salted water according to the package directions until al dente. Rinse and halve the onions. Peel and finely dice the garlic and onions. Heat the oil in a pan, and sauté the onion and garlic until soft. Mix in the tomatoes, sprinkle with the sugar, and pour in the vegetable broth. Reduce the heat, and simmer gently for 5 minutes. Rinse and dry the basil. Coarsely chop the leaves, then add into the sauce.