Ah, this reminds me of my youth, when we had more tomatoes than we knew what to do with. My mother would slice them, not too thin, and lay them on clean cloths or racks in the hot sun. We would bring them in at night to protect them from dew. After a few days, they become leathery and so full of flavour. You must have strong sun and no rain, of course. If your weather is not suitable, a very low oven can do the same job. They keep for months in a jar.