Paste tomatoes have a high dry matter content and so make thick sauces. They are often not so tasty when raw but develop a great flavour when cooked. Long keeping varieties maintain their hardness for a long time even when the colour is indicating they are ripe. They will store on the vine in a green house until frost threatens then they are best in the kitchen where you can keep an eye on them. A sunny window sill speeds ripening and a cool dark place keeps them for longer.