Heat the olive oil in a large frying-pan, add ground beef and scramble-fry until starting to brown. In the meantime, grate onion, carrot, zuchini and garlic (in food processor or by hand). Sprinkle with some salt, then put in large sieve, press and let drain some.  When ground beef is ready, add vegetables and cook until nearly soft. Add tomato puree, Italian seasoning and tomato paste, simmer for about 10 min more until flavors melt. Sason with sea salt, black pepper and a little sweetener of choice (optional).