tomato-based preparation obtained by mixing one of the products referred to at (i), (k), (l), (m) or (n) above with other products of plant or animal origin except fresh tomatoes, having undergone a heat treatment, packed in hermetically sealed containers where the net weight of the products referred to at (i), (k), (l), (m) or (n) accounts for at least 60% of the total net weight of the prepared sauce