Here's the easy recipe for my sun dried tomatoes. Disclaimer - they aren't actually dried in the sun! You could do that I'm sure (in fact I've read that you can leave them in your car on a hot sunny day) but since I happen to have a dehydrator I do it that way. You could also use your oven.
Get as many cherry tomatoes as you can find and slice them about 8mm thick. (If you just cut them in half there will be more flesh and they will take longer to dry.) Put them in a bowl or plastic bag with 1 tsp salt, 1 tbsp dried (or a bit more fresh) oregano, 2 cloves minced garlic, 2 tbsp oil, 2 tbsp caster sugar, and toss to coat. (Don't throw away the flavoured oil... it is great for a stir fry base or for frying up eggs and bacon and tomatoes!)
Spread the tomato slices on a dehydrator or oven tray and dry at 60C. I put mine on at about 6pm and left them overnight, so probably about 14 hours. Check them after about 10 hours, you may find that some pieces have dried and the rest need a few more hours.
To store I just put them in a ziplock bag and freeze. They defrost quickly, or you can speed things up by running them under hot water. Enjoy a little piece of summer in salads, pasta, sandwiches and pizza in the depths of winter.