First you'll want to lightly grease a baking sheet with oil of your choice. Olive oil is a great choice because you'll ultimately be mixing some into your final product. We also spread out a small amount of leftover bacon fat for flavor but this is totally optional.
Next you'll want to slice your tomatoes into thin slices. The thinner they are the quicker they'll cook. We cut them about 1/3 inch thick.
Sprinkle salt, pepper, and Italian seasoning evenly over the top of all tomatoes. ***VERY IMPORTANT*** Make sure you don't over salt the tomatoes, they will shrink down significantly and that salt will be stronger after the condense down.
If using fresh basil you'll want to chop it finely and sprinkle it over the top of the tomatoes.
Heat the oven to 225 degrees and place the pan inside.
The time is going to vary significantly depending on the temperature, thickness, and your desired preference for the finished effect. We cooked ours in about 2.5 hours. You can also raise the temperature of the oven if you're in a hurry, just make sure to adjust the cooking time.
Continue checking your tomatoes every 30-45 minutes. Less time when they're getting close to being done.
Once the tomatoes are cooked to your desired done-ness you can pull them out and chop them finely, or leave them in larger chunks. Totally up to you!
You can store this in a mason jar or use it right out of the oven in a great meal.
We also drizzled a little extra extra virgin olive oil over the tomatoes and of course sampled them. Now you can add additional salt or pepper if needed.